Korean 「-자마자」 means that as soon as one action is completed, the next event immediately follows. In English, it is usually translated as “as soon as…” or “the moment…”. For example, 「집에 도착하자마자 샤워했어요」 does not simply mean that someone took a shower after getting home. It means that the shower began almost immediately after arriving home.

The patterns most easily confused with it are 「-고 나서」 and 「-(으)ㄴ 후에」. These two patterns can also express that A happens before B, but the amount of time between them is not important. With 「-자마자」, however, the distance between the two events is explicitly compressed. Once you check whether there is a noticeable gap between A and B, the nuance of 「-자마자」 becomes much easier to distinguish than its translation may suggest.

What Does Korean 「-자마자」 Mean? The Second Event Happens Immediately After the First

「-자마자」 is a connective ending attached to a verb stem. It means that once the action in the first clause is realized, the event or action in the second clause follows immediately. The National Institute of Korean Language likewise explains 「-자마자」 as indicating that after the action in the preceding clause is realized, the event or action in the following clause occurs right afterward. Its real focus, therefore, is the very short time interval between the two events.

The first clause often contains an action with a clear point of realization, such as arriving, waking up, opening a door, seeing, hearing, receiving, or finishing. The second clause may contain a deliberate action or simply a naturally occurring result.

• Example: 집에 도착하자마자 샤워했어요.
  Romanization: jib-e do-chak-ha-ja-ma-ja sya-wo-hae-sseo-yo.
  Translation: I took a shower as soon as I got home.
  Once 「도착하다」 is completed, the shower begins almost immediately. Compared with simply saying “I showered after getting home,” this sentence has a much stronger sense of immediate succession.
• Example: 수업이 끝나자마자 비가 왔어요.
  Romanization: su-eob-i kkeut-na-ja-ma-ja bi-ga wa-sseo-yo.
  Translation: It started raining as soon as class ended.
  The subjects of the two clauses do not need to be the same. “Class ending” creates the time boundary, and the rain begins immediately afterward.
• Example: 그 소식을 듣자마자 가족에게 전화했어요.
  Romanization: geu so-sik-eul deut-ja-ma-ja ga-jok-e-ge jeon-hwa-hae-sseo-yo.
  Translation: I called my family as soon as I heard the news.
  “Hearing the news” becomes the point at which the reaction in the second clause begins, and the two events are presented as nearly continuous.

Korean 「-자마자」 Conjugation Rules: Add 「-자마자」 Directly to the Verb Stem

「-자마자」 attaches directly to the verb stem and does not change according to whether the verb has a final consonant. 「가다」 becomes 「가자마자」, 「먹다」 becomes 「먹자마자」, and 「도착하다」 becomes 「도착하자마자」.

The National Institute of Korean Language treats 「-자마자」 as a complete connective ending. It attaches to a verb stem or to the honorific pre-final ending 「-으시-」 and is written together with the preceding verb.

Conjugation Type	Structure	Example	Meaning
Verb without final consonant	Stem＋자마자	가자마자	As soon as someone goes / arrives…
Verb with final consonant	Stem＋자마자	먹자마자	As soon as someone eats…
하다 verb	하→하자마자	도착하자마자	As soon as someone arrives…
ㄷ-final verb	Stem＋자마자	듣자마자	As soon as someone hears…
Honorific form	-(으)시＋자마자	오시자마자	As soon as someone comes…
Adjective	Usually does not attach directly	× 예쁘자마자	Use a verb expressing change instead

Why Does 「듣다」 Become 「듣자마자」 With 「-자마자」?

Although 「듣다」 is a ㄷ-irregular verb, ㄷ does not change to ㄹ before every ending. In 「들어요」, the ㄷ changes because 「-어요」 begins with a vowel. 「-자마자」 begins with the consonant ㅈ, so the stem remains 「듣-」.

• Example: 알람 소리를 듣자마자 일어났어요.
  Romanization: al-lam so-ri-reul deut-ja-ma-ja i-reo-na-sseo-yo.
  Translation: I got up as soon as I heard the alarm.
  The stem 「듣-」 remains unchanged before 「-자마자」. It should not be written as 「들자마자」.
• Example: 문을 열자마자 고양이가 밖으로 나갔어요.
  Romanization: mun-eul yeol-ja-ma-ja go-yang-i-ga bak-eu-ro na-ga-sseo-yo.
  Translation: As soon as the door opened, the cat ran outside.
  「열다」 simply takes the stem 「열-」 plus 「-자마자」.
• Example: 손님이 오시자마자 회의를 시작했어요.
  Romanization: son-nim-i o-si-ja-ma-ja hoe-ui-reul si-jak-hae-sseo-yo.
  Translation: We started the meeting as soon as the guest arrived.
  When the subject of the first clause needs to be honored, 「-시-」 can remain, producing 「오시자마자」.

Can 「-았/었-」 Be Added Before 「-자마자」?

Even when the entire event happened in the past, the first clause still uses the verb stem directly with 「-자마자」. Past, present, or future time is normally expressed through the tense of the second clause and the surrounding context.

❌ 갔자마자 친구를 만났어요.
✅ 가자마자 친구를 만났어요.

❌ 먹었자마자 배가 아팠어요.
✅ 먹자마자 배가 아팠어요.

• Example: 학교에 가자마자 친구를 만났어요.
  Romanization: hak-gyo-e ga-ja-ma-ja chin-gu-reul man-na-sseo-yo.
  Translation: I met a friend as soon as I got to school.
  The entire event happened in the past, but that is expressed by 「만났어요」. The first clause does not become 「갔자마자」.
• Example: 밥을 먹자마자 배가 아팠어요.
  Romanization: bab-eul meok-ja-ma-ja bae-ga a-pa-sseo-yo.
  Translation: My stomach hurt as soon as I finished eating.
  「먹자마자」 remains in its basic form, while the past time is understood from 「아팠어요」.
• Example: 도착하자마자 연락할게요.
  Romanization: do-chak-ha-ja-ma-ja yeol-lak-hal-ge-yo.
  Translation: I’ll contact you as soon as I arrive.
  「-자마자」 can also describe something that has not happened yet. 「연락할게요」 places the whole sentence in the future.

Can Korean Adjectives Take 「-자마자」?

「-자마자」 needs the first clause to provide an event that can begin, become established, or be completed, so it mainly attaches to verbs. Static qualities such as “pretty,” “busy,” or “cheap” do not have a clear completion point and therefore do not normally take 「-자마자」 directly.

❌ 예쁘자마자
❌ 바쁘자마자

If the intended meaning is “as soon as it becomes pretty…” or “as soon as it becomes busy…,” the state needs to be changed into an eventive expression such as 「예뻐지다」 or 「바빠지다」 and then used according to the actual context.

Three Common Uses of Korean 「-자마자」: Actions, Reactions, and Sudden Events

「-자마자」 does not require the second clause to describe something deliberately done by a person. It only requires the second event to follow immediately after the first action is realized. This means it can be used for everyday routines, immediate reactions to information, and naturally occurring events.

「-자마자」 Usage ①｜Starting the Next Action Immediately After the First One Finishes

This is the most straightforward use of 「-자마자」. The same person completes A and directly moves into B, with almost nothing else worth mentioning in between. Everyday routines such as waking up, arriving at work, getting home, or entering a store commonly use this pattern.

• Example: 아침에 일어나자마자 창문을 열어요.
  Romanization: a-chim-e i-reo-na-ja-ma-ja chang-mun-eul yeo-reo-yo.
  Translation: I open the window as soon as I wake up in the morning.
  Once 「일어나다」 is completed, opening the window immediately follows. This can describe a regular habit.
• Example: 회사에 도착하자마자 이메일을 확인했어요.
  Romanization: hoe-sa-e do-chak-ha-ja-ma-ja i-me-il-eul hwak-in-hae-sseo-yo.
  Translation: I checked my email as soon as I got to work.
  If you changed this to 「도착한 후에」, you would only know that the email was checked after arrival. 「-자마자」 clearly indicates that it was checked immediately.
• Example: 문을 열자마자 고양이가 밖으로 나갔어요.
  Romanization: mun-eul yeol-ja-ma-ja go-yang-i-ga bak-eu-ro na-ga-sseo-yo.
  Translation: As soon as the door opened, the cat ran outside.
  The subjects can be different because 「-자마자」 requires close timing, not the same subject.

「-자마자」 Usage ②｜Reacting Immediately After Seeing, Hearing, or Receiving Information

Verbs such as 「보다」「듣다」「받다」 easily create a clear starting point for a reaction. Remembering someone’s name the moment you see them, contacting someone immediately after receiving a notification, or getting up as soon as you hear a sound all work naturally with 「-자마자」.

• Example: 그 사람을 보자마자 이름이 생각났어요.
  Romanization: geu sa-ram-eul bo-ja-ma-ja i-reum-i saeng-gak-na-sseo-yo.
  Translation: I remembered the name as soon as I saw that person.
  The second clause is not a deliberately planned action but an immediate memory response triggered by seeing the person.
• Example: 알람 소리를 듣자마자 일어났어요.
  Romanization: al-lam so-ri-reul deut-ja-ma-ja i-reo-na-sseo-yo.
  Translation: I got up as soon as I heard the alarm.
  The alarm provides the point at which the reaction begins, and getting up follows immediately.
• Example: 합격 문자를 받자마자 부모님께 알렸어요.
  Romanization: hap-gyeok mun-ja-reul bat-ja-ma-ja bu-mo-nim-kke al-lyeo-sseo-yo.
  Translation: I told my parents as soon as I received the acceptance message.
  The gap between receiving the message and telling the parents is presented as extremely short, making this suitable for describing an immediate reaction.

「-자마자」 Usage ③｜A Natural Event or Change Happens Immediately After the First Event

The second clause of 「-자마자」 can also contain events such as the rain stopping, a crowd becoming quiet, or applause beginning. No one needs to deliberately control the second event. Examples collected by the National Institute of Korean Language also include structures where different event subjects appear, such as heavy rain beginning immediately after someone arrives home.

• Example: 영화가 시작되자마자 극장이 조용해졌어요.
  Romanization: yeong-hwa-ga si-jak-doe-ja-ma-ja geuk-jang-i jo-yong-hae-jyeo-sseo-yo.
  Translation: As soon as the movie started, the theater became quiet.
  The original 「영화가 시작하자마자」 should be corrected. When the movie itself “starts,” Korean normally uses the intransitive structure 「영화가 시작되다」.
• Example: 비가 그치자마자 사람들이 밖으로 나왔어요.
  Romanization: bi-ga geu-chi-ja-ma-ja sa-ram-deur-i bak-eu-ro na-wa-sseo-yo.
  Translation: As soon as the rain stopped, people came outside.
  「그치다」 creates a clear point of change, and the people act immediately after the rain ends.
• Example: 발표가 끝나자마자 사람들이 박수를 쳤어요.
  Romanization: bal-pyo-ga kkeut-na-ja-ma-ja sa-ram-deur-i bak-su-reul chyeo-sseo-yo.
  Translation: As soon as the presentation ended, everyone applauded.
  The end of the presentation and the applause occur in close succession, and the subjects of the two clauses may still differ.

What Is the Difference Between Korean 「-자마자」「-고 나서」「-는 대로」? Comparing Five Time Expressions

All of these patterns can appear in sentences where B happens after A, but only 「-자마자」 directly builds the idea of almost no time gap into the grammar itself.

「-고 나서」 and 「-(으)ㄴ 후에」 focus more on sequence. The temporal use of 「-자」 can indicate that once the first event appears, the next event follows, but it has a stronger narrative quality and 「-자」 itself also has other causal uses. One use of 「-는 대로」 means that once a certain condition appears, the next action is handled immediately. It is especially common in promises, instructions, and future arrangements. The Korean Basic Dictionary of the National Institute of Korean Language also defines one meaning of 「-는 대로」 as doing something immediately when a certain action or situation occurs, or right after it.

Comparison	「-자마자」	「-고 나서」	「-(으)ㄴ 후에」	「-자」	「-는 대로」
Common English translation	As soon as…, the moment…	After doing…, then…	After…	When / once…, then…	As soon as…, once…
Time relationship	B happens immediately after A is completed	B happens after A is completed	B happens at some point after A	B follows after A occurs	Once A becomes true, B is handled immediately
Emphasizes “immediately”?	Very strongly	No	No	Depends on context	Strongly
Can there be a noticeable gap between A and B?	Usually not	Yes	Yes, even a long one	Depends on context	Usually does not emphasize waiting; action follows once the condition is met
Main focus	Very short time gap between events	Do B after finishing A	Simply establish a time after A	Narrative progression of events	Immediate handling once a condition is met
Must A be completed or established first?	Yes, A needs to form a clear time point	Usually yes	A serves as the reference point for “after”	A occurs first	A condition or situation must first become established
Common first-clause verbs	도착하다、끝나다、일어나다、보다、듣다、받다	먹다、씻다、끝나다、공부하다 and ordinary actions	회의가 끝나다、식사하다, etc.	열다、나가다、추워지다, etc.	도착하다、결과가 나오다、확인되다, etc.
Can B be a deliberate action?	Yes	Yes	Yes	Yes	Very commonly, especially notifying, contacting, handling
Can B be a natural / sudden event?	Yes, very naturally	Yes, but the grammar itself only marks sequence	Yes	Yes, common in narration	More commonly an actionable follow-up
Must the subjects be the same?	No	No	No	No	No
Past events	Very common	Very common	Very common	Common in narration	Possible, but not its most representative context
Future plans	Possible	Possible	Possible	Relatively less suitable for ordinary personal plans	Very common
Instructions / requests	Possible, but not the most typical use	Possible	Possible	Less common	Very natural
Promises / work arrangements	Possible	Possible	Possible	Less common	Especially common
Register	Natural in both speech and general narration	Common in everyday conversation	Neutral and also common in formal explanation	More written and narrative	Usable in daily speech; also very common in work and formal contexts
Can the first clause directly take 「-았/었-」?	No, use 가자마자, not 갔자마자	Follows normal grammar, though the basic pattern attaches directly to the verb	Uses an adnominal form, such as 먹은 후에	Usually attaches directly to the stem	Uses present adnominal form -는 대로
Best way to decide	Did B happen immediately after A?	Is the point that A was finished first, then B happened?	Do you simply mean “after A”?	Is the text narrating B as the next event after A?	Are you waiting for A to happen so B can be handled immediately?
Typical example	집에 도착하자마자 샤워했어요.	손을 씻고 나서 밥을 먹었어요.	회의가 끝난 후에 자료를 정리했어요.	문을 열자 사람들이 들어왔다.	결과가 나오는 대로 연락드리겠습니다.
Natural English nuance	I showered immediatelyafter arriving home	I washed my hands and then ate	I organized the materials afterthe meeting	The door opened, and people thencame in	I’ll contact you as soon as the result comes out
Common confusion	Assuming it can be used whenever A simply precedes B	Assuming it always means “immediately”	Confusing it with 「-고 나서」 because both mean “after”	Assuming it is merely a shorter version of 「-자마자」	Assuming it can always replace 「-자마자」

▌「-자마자」 vs 「-고 나서」｜Immediate Succession vs Simple Sequence

「-고 나서」 confirms that A is completed before moving on to B, but the speaker may rest, chat, or even wait for some time in between. The National Institute of Korean Language also analyzes 「-고 나서」 as indicating that the preceding action has ended before expressing what happens afterward.

• Example: 손을 씻고 나서 밥을 먹었어요.
  Romanization: son-eul ssit-go na-seo bab-eul meo-geo-sseo-yo.
  Translation: I ate after washing my hands.
  This sentence only establishes that washing hands came first and eating came afterward. Whether there was a small time gap is not important.
• Example: 손을 씻자마자 밥을 먹었어요.
  Romanization: son-eul ssit-ja-ma-ja bab-eul meo-geo-sseo-yo.
  Translation: I ate as soon as I finished washing my hands.
  Once 「-자마자」 is used, eating is pulled right up to the point immediately after washing hands.
• Example: 수업이 끝나고 나서 카페에 갔어요.
  Romanization: su-eob-i kkeut-na-go na-seo ka-pe-e ga-sseo-yo.
  Translation: I went to a café after class.
  If you are only describing the order of activities, 「-고 나서」 is usually enough. There is no need to emphasize speed.

▌「-자마자」 vs 「-(으)ㄴ 후에」｜Immediate Succession vs General “After”

The 「후」 in 「-(으)ㄴ 후에」 literally means “after.” Its main job is simply to establish a before-and-after relationship. Whether A and B are separated by five minutes, an hour, or even longer does not change the basic meaning.

• Example: 회의가 끝난 후에 자료를 정리했어요.
  Romanization: hoe-ui-ga kkeut-nan hu-e ja-ryo-reul jeong-ni-hae-sseo-yo.
  Translation: I organized the materials after the meeting ended.
  The sentence does not tell us whether the organization began immediately after the meeting or somewhat later.
• Example: 회의가 끝나자마자 자료를 정리했어요.
  Romanization: hoe-ui-ga kkeut-na-ja-ma-ja ja-ryo-reul jeong-ni-hae-sseo-yo.
  Translation: I organized the materials as soon as the meeting ended.
  The organizing action is moved right up to the point when the meeting ends.
• Example: 식사한 후에 산책했어요.
  Romanization: sik-sa-han hu-e san-chaek-hae-sseo-yo.
  Translation: I took a walk after eating.
  If you are simply describing a daily schedule, 「-(으)ㄴ 후에」 is more neutral than 「-자마자」 and does not additionally imply that you went out immediately.

▌「-자마자」 vs 「-자」｜Immediate Succession vs Narrative Event Progression

One use of 「-자」 can mean that once the first event occurs, the second follows, as in 「문을 열자 사람들이 들어왔다」. This form is common in written narration describing how events unfold, while 「-자마자」 explicitly includes the meaning of “immediately” and “right afterward” and is also very common in everyday speech.

In addition, 「-자」 can also indicate that the preceding event becomes the cause or motivation for what follows, so not every 「-자」 can be understood as a shortened form of 「-자마자」. The National Institute of Korean Language separately records a use of 「-자」 in which the preceding event becomes the cause or motivation leading to the following event.

• Example: 문을 열자 사람들이 들어왔다.
  Romanization: mun-eul yeol-ja sa-ram-deur-i deu-reo-wa-tta.
  Translation: When the door opened, people came in.
  「-자」 moves the narrative forward from one event to the next and carries a clearer written, narrative tone.
• Example: 문을 열자마자 고양이가 뛰어나갔어요.
  Romanization: mun-eul yeol-ja-ma-ja go-yang-i-ga ttwi-eo-na-ga-sseo-yo.
  Translation: As soon as the door opened, the cat ran out.
  「-자마자」 more directly emphasizes that almost no time passed between opening the door and the cat rushing out.
• Example: 날씨가 추워지자 난방 사용량이 늘었다.
  Romanization: nal-ssi-ga chu-wo-ji-ja nan-bang sa-yong-nyang-i neu-reo-tta.
  Translation: As the weather became colder, heating usage increased.
  Here, 「-자」 can express the development of events or a causal relationship. It does not necessarily mean that heating use increased at the exact instant the weather became cold.

▌「-자마자」 vs 「-는 대로」｜Events Happening Immediately vs Acting Once a Condition Is Met

One temporal use of 「-는 대로」 means doing the second action as soon as the first event occurs, which makes it quite close to 「-자마자」. However, 「-는 대로」 is especially common with future events that have not happened yet, as well as promises and workplace instructions such as “I’ll contact you as soon as the result comes out” or “Report back as soon as you arrive.”

• Example: 결과가 나오는 대로 연락드리겠습니다.
  Romanization: gyeol-gwa-ga na-o-neun dae-ro yeol-lak-deu-ri-ge-sseum-ni-da.
  Translation: I will contact you as soon as the result comes out.
  The result has not yet appeared. The speaker is promising to act immediately once the condition is met, making 「-는 대로」 very natural.
• Example: 결과가 나오자마자 친구에게 보여 줬어요.
  Romanization: gyeol-gwa-ga na-o-ja-ma-ja chin-gu-e-ge bo-yeo jwo-sseo-yo.
  Translation: I showed it to my friend as soon as the result came out.
  This sentence describes an event that actually happened, and 「-자마자」 directly shortens the time distance between the two events.
• Example: 도착하는 대로 담당자에게 연락해 주세요.
  Romanization: do-chak-ha-neun dae-ro dam-dang-ja-e-ge yeol-lak-hae ju-se-yo.
  Translation: Please contact the person in charge as soon as you arrive.
  This instructs the listener to take action immediately upon arrival, making 「-는 대로」 especially common in workplace arrangements and formal instructions.

How Do You Choose in the Same Situation? Comparing 「-자마자」「-고 나서」「-(으)ㄴ 후에」「-자」「-는 대로」

All five patterns can connect two events with a before-and-after relationship, but changing the grammar changes what the sentence focuses on. Using “contacting the person in charge after arriving” as the shared situation, the first clause is always “arrive” and the second is always “contact the person in charge.” The difference is whether the speaker wants to express immediate action, simple sequence, a general time relationship, narrative progression, or action taken once a condition is met.

• 「-자마자」｜You arrive and immediately contact them
  Example: 도착하자마자 담당자에게 연락했어요.
  Romanization: do-chak-ha-ja-ma-ja dam-dang-ja-e-ge yeol-lak-hae-sseo-yo.
  Translation: I contacted the person in charge as soon as I arrived.
  This sentence places “arriving” and “contacting” very close together. It sounds as though the speaker had barely reached the destination before immediately taking out their phone, with no other notable activity in between.
• 「-고 나서」｜First arrive, then contact them
  Example: 도착하고 나서 담당자에게 연락했어요.
  Romanization: do-chak-ha-go na-seo dam-dang-ja-e-ge yeol-lak-hae-sseo-yo.
  Translation: I contacted the person in charge after arriving.
  This sentence mainly establishes the sequence: arrival first, contact second. The person may have called immediately after getting out, or may have collected luggage and checked their location first. The grammar itself does not tell us how much time passed.
• 「-(으)ㄴ 후에」｜Treating “after arrival” as a point in time
  Example: 도착한 후에 담당자에게 연락했어요.
  Romanization: do-chak-han hu-e dam-dang-ja-e-ge yeol-lak-hae-sseo-yo.
  Translation: I contacted the person in charge after arriving.
  The meaning is close to 「-고 나서」, but 「-(으)ㄴ 후에」 more simply establishes “after arriving” as the time position. The sentence does not particularly emphasize immediate succession or how the two actions connect, making it natural in schedules and neutral narration.
• 「-자」｜You arrive, and the narrative immediately moves to the next event
  Example: 도착하자 담당자에게 연락했다.
  Romanization: do-chak-ha-ja dam-dang-ja-e-ge yeol-lak-hae-tta.
  Translation: Upon arriving, I contacted the person in charge.
  Here, 「-자」 pushes the narrative directly from one event into the next. After “arrival” happens, the narration proceeds to “contacting the person in charge.” Compared with 「-자마자」, it places less deliberate emphasis on the fact that there was almost no time gap and is more common in written narration.
• 「-는 대로」｜Once you arrive, handle the next step immediately as arranged
  Example: 도착하는 대로 담당자에게 연락해 주세요.
  Romanization: do-chak-ha-neun dae-ro dam-dang-ja-e-ge yeol-lak-hae ju-se-yo.
  Translation: Please contact the person in charge as soon as you arrive.
  This sentence does not look back on something that already happened. Instead, it waits for the condition “arrival” to be met. Once it is, the next step is to contact the person in charge. That is why this form is common in itineraries, workplace instructions, and promises. 「-자마자」 focuses more on the two events being very close in time, while 「-는 대로」 often carries the feeling of “once the condition is met, proceed with the next step as planned.”

When placed into the same situation, 「도착하자마자」 emphasizes that arrival and contact happen with almost no gap; 「도착하고 나서」 only tells us that arrival happens first and contact happens afterward; 「도착한 후에」 simply places the contact after arrival; 「도착하자」 sounds like the next event in a narrative; and 「도착하는 대로」 often appears before the event has happened, establishing what should be done immediately once arrival occurs. All of them may be translated similarly, but the time relationships they actually express in Korean are different.

Does Korean 「-자마자」 Express Cause and Effect? Its Main Function Is Immediate Timing

Two events being close together in time does not mean that A necessarily causes B. 「수업이 끝나자마자 비가 왔어요」 simply means that it started raining immediately after class ended; class ending did not cause the rain. 「문을 열자마자 고양이가 나갔어요」, on the other hand, may involve both immediate timing and an event-trigger relationship.

Therefore, when you see 「-자마자」, it is more accurate to first read it as expressing immediate temporal succession. If there is also a causal relationship, that relationship comes from the events themselves, not because 「-자마자」 automatically adds a meaning of “because.”

• Example: 집에 도착하자마자 비가 쏟아지기 시작했어요.
  Romanization: jib-e do-chak-ha-ja-ma-ja bi-ga sso-da-ji-gi si-jak-hae-sseo-yo.
  Translation: As soon as I got home, it started pouring.
  Arriving home did not cause the rain. The two events simply happen immediately one after another.
• Example: 버스에서 내리자마자 전화가 왔어요.
  Romanization: beo-seu-e-seo nae-ri-ja-ma-ja jeon-hwa-ga wa-sseo-yo.
  Translation: I got a phone call as soon as I got off the bus.
  The phone call does not need to have any causal connection with getting off the bus.
• Example: 불을 켜자마자 방이 밝아졌어요.
  Romanization: bul-eul kyeo-ja-ma-ja bang-i bal-ga-jyeo-sseo-yo.
  Translation: The room became bright as soon as I turned on the light.
  This sentence does contain a cause-and-effect relationship, but 「-자마자」 still primarily marks the fact that the two events happen immediately one after the other.

Practical Korean for Travel With 「-자마자」: Transportation, Messages, and Itineraries

「-자마자」 is very useful for describing a tightly packed day. Going straight to the hotel after getting off the plane, heading directly to the station after checking out, or taking a screenshot immediately after receiving a reservation confirmation can all naturally use this form. If other activities happen in between, 「-고 나서」 may better match the actual timing.

▌Situation ①｜Going Straight to the Airport After Work

A：오늘 퇴근하고 뭐 해요?
　　o-neul toe-geun-ha-go mwo hae-yo?
　　What are you doing after work today?

B：퇴근하자마자 공항에 가요. 비행기가 저녁 일곱 시예요.
　　toe-geun-ha-ja-ma-ja gong-hang-e ga-yo. bi-haeng-gi-ga jeo-nyeok il-gop si-ye-yo.
　　I’m going to the airport as soon as I get off work. My flight is at seven in the evening.

📌 Grammar Point: 「퇴근하자마자」 means that there is almost nothing else planned between finishing work and going to the airport. If you simply mean “I’ll go to the airport after work,” 「퇴근하고 나서」 is also possible.

▌Situation ②｜Replying Immediately After Seeing a Message

A：예약 확인 메시지 봤어요?
　　ye-yak hwak-in me-si-ji bwa-sseo-yo?
　　Did you see the reservation confirmation message?

B：네, 보자마자 답장했어요.
　　ne, bo-ja-ma-ja dap-jang-hae-sseo-yo.
　　Yes, I replied as soon as I saw it.

📌 Grammar Point: The moment the action 「보다」 is completed becomes the point when the reply begins. If the person waited for a while before replying, it would be unnatural to deliberately use 「-자마자」.

▌Situation ③｜Going Straight to a Restaurant After Arriving at the Hotel

A：호텔에 도착하면 먼저 쉴 거예요?
　　ho-tel-e do-chak-ha-myeon meon-jeo swil geo-ye-yo?
　　Will you rest first when you get to the hotel?

B：아니요. 짐만 놓고 바로 나갈 거예요. 도착하자마자 식당에 가야 해요.
　　a-ni-yo. jim-man no-ko ba-ro na-gal geo-ye-yo. do-chak-ha-ja-ma-ja sik-dang-e ga-ya hae-yo.
　　No. I’m just going to drop off my luggage and head out. I have to go to the restaurant as soon as I arrive.

📌 Grammar Point: 「-자마자」 can also be used with future plans. The second action has not happened yet, but the itinerary has already been arranged so that it will begin immediately after the first event is completed.

Cultural Notes:

1. In everyday Korean, 「-자마자」 already has a strong sense of immediacy, so 「바로」 is not always necessary. However, 「도착하자마자 바로 전화했어요」 is still possible, and 「바로」 further strengthens the sense of acting without delay.
2. In workplace messages, when expressing “I’ll let you know as soon as something is confirmed,” 「-는 대로」 is often more suitable than 「-자마자」, as in 「확인되는 대로 알려 드리겠습니다」. This kind of sentence deals with a condition that has not yet been realized and what will be done afterward, rather than narrating two completed events.
3. 「-자마자」 works naturally in both conversation and general narration. The temporal use of 「-자」 more often contributes to event progression in written narrative. Both may be translated as “as soon as…,” but their register and sentence focus are not exactly the same.

How Does Korean 「-자마자」 Compare With Japanese 「〜たらすぐ／〜てすぐ／〜た途端（に）」?

Korean 「-자마자」 means that once the first action is completed, the second event immediately follows. The second clause can contain a deliberately planned action by the speaker, a naturally occurring event, something uncontrollable, or something unexpected. Japanese does not have one fixed pattern that covers every use of 「-자마자」, so the appropriate expression must be selected according to the nature of the second clause: 「〜たらすぐ」「〜てすぐ」 or 「〜た途端（に）」.

「〜たらすぐ」 works well when an action is deliberately performed immediately after the first event and is also common in plans, instructions, and requests. 「〜てすぐ」 neutrally describes two actions occurring in close succession. 「〜た途端（に）」 emphasizes the exact moment the first action is completed and the second event suddenly happens. The Japan Foundation explains that the second clause of 「〜た途端（に）」 more readily contains a sudden or unexpected event, and using it directly with an intentionally planned action by the subject can sometimes sound unnatural. The particle 「に」 may be omitted.

◆ Similar Grammar ①: Japanese 「〜たらすぐ」

「〜たらすぐ」 treats the first event as the time condition for beginning the second, meaning “once the first action is completed, immediately do the second.” The second clause can describe a deliberately planned action, a request, an instruction, or a future plan, so it corresponds well to many everyday uses of Korean 「-자마자」.

• Example: 家に着いたらすぐシャワーを浴びました。
  Kana: いえについたらすぐしゃわーをあびました。
  Translation: I took a shower as soon as I got home.
  Corresponds to Korean 「집에 도착하자마자 샤워했어요」. Taking a shower is the speaker’s deliberately chosen next action, so 「〜たらすぐ」 sounds more natural than 「家に着いた途端、シャワーを浴びました」.
• Example: 駅に着いたらすぐ連絡してください。
  Kana: えきについたらすぐれんらくしてください。
  Translation: Please contact me as soon as you arrive at the station.
  Corresponds to Korean 「역에 도착하자마자 연락해 주세요」. 「〜たらすぐ」 can take requests and instructions and means to contact someone immediately after arriving.
• Example: 授業が終わったらすぐ図書館へ行きます。
  Kana: じゅぎょうがおわったらすぐとしょかんへいきます。
  Translation: I’ll go to the library as soon as class ends.
  Corresponds to Korean 「수업이 끝나자마자 도서관에 갈 거예요」. The second clause describes an action the speaker intends to perform, so Japanese 「〜たらすぐ」 naturally expresses the future arrangement.

◆ Similar Grammar ②: Japanese 「〜てすぐ」

「〜てすぐ」 neutrally indicates that the second event follows shortly after the first is completed. It can describe deliberate actions as well as naturally occurring results, but unlike 「〜た途端（に）」, it does not particularly emphasize instantaneousness, suddenness, or surprise.

• Example: 結果を受け取ってすぐ、担当者に連絡しました。
  Kana: けっかをうけとってすぐ、たんとうしゃにれんらくしました。
  Translation: I contacted the person in charge immediately after receiving the result.
  Corresponds to Korean 「결과를 받자마자 담당자에게 연락했어요」. The second clause is a deliberate action taken after receiving the result, and 「〜てすぐ」 directly states that the two events happened in close succession.
• Example: 店を出てすぐ、雨が降り始めました。
  Kana: みせをでてすぐ、あめがふりはじめました。
  Translation: It started raining shortly after I left the store.
  Corresponds to Korean 「가게에서 나오자마자 비가 내리기 시작했어요」. 「〜てすぐ」 simply describes the fact that rain began very soon after leaving the store without especially emphasizing suddenness or surprise.
• Example: 入社してすぐ、新しい仕事を任されました。
  Kana: にゅうしゃしてすぐ、あたらしいしごとをまかされました。
  Translation: I was given a new assignment soon after joining the company.
  Corresponds to Korean 「입사하자마자 새 업무를 맡았어요」. This does not necessarily mean the exact same instant as joining the company, only that very little time passed afterward, so 「〜てすぐ」 sounds more natural than 「〜た途端（に）」.

◆ Similar Grammar ③: Japanese 「〜た途端（に）」

「〜た途端（に）」 emphasizes the exact moment the first event is completed, after which the second event suddenly occurs. The second clause is usually something the speaker did not deliberately arrange, could not control, or finds unexpected. The particle 「に」 may be omitted, so both 「〜た途端」 and 「〜た途端に」 are possible.

• Example: 家に着いた途端、大雨が降り出しました。
  Kana: いえについたとたん、おおあめがふりだしました。
  Translation: The moment I got home, it suddenly started pouring.
  Corresponds to Korean 「집에 도착하자마자 비가 쏟아지기 시작했어요」. The heavy rain is not something the speaker can control and begins suddenly at the moment of arrival, making 「〜た途端」 very suitable.
• Example: ドアを開けた途端、猫が外へ飛び出しました。
  Kana: どあをあけたとたん、ねこがそとへとびだしました。
  Translation: The moment the door opened, the cat suddenly rushed outside.
  Corresponds to Korean 「문을 열자마자 고양이가 밖으로 뛰어나갔어요」. The cat rushing out is a sudden event that occurs immediately after the door opens and carries the sense that the speaker did not expect it.
• Example: 電気を消した途端、赤ちゃんが泣き出しました。
  Kana: でんきをけしたとたん、あかちゃんがなきだしました。
  Translation: The moment the light was turned off, the baby suddenly started crying.
  Corresponds to Korean 「불을 끄자마자 아기가 울기 시작했어요」. The baby crying is not an intentionally arranged action by the person turning off the light, so 「〜た途端」 expresses the sudden event more naturally than simple 「〜たらすぐ」.

◆ Core Differences From the Three Japanese Expressions:
Korean 「-자마자」 can be used whenever the second event follows immediately after the first action is completed. The second clause may contain a deliberate action, a future arrangement, a request, or a natural event. Japanese distributes these functions more specifically according to meaning: deliberate arrangements, instructions, and plans usually use 「〜たらすぐ」; neutral descriptions of two events occurring in close succession can use 「〜てすぐ」; and when the sentence emphasizes an unexpected event occurring at the exact moment the first event ends, 「〜た途端（に）」 is appropriate. Therefore, Korean 「-자마자」 cannot always be translated as 「〜た途端（に）」. First check whether the second clause is an intentional action by the subject and whether the sentence needs a sense of suddenness or surprise.

The most important thing to remember about Korean 「-자마자」 is not simply its translation as “as soon as…,” but that there is almost no gap between the two events. If you only need to say “finish A and then do B,” 「-고 나서」 or 「-(으)ㄴ 후에」 is enough. Use 「-자마자」 when you really want to push the second event right up against the moment the first one is completed.

When you encounter workplace expressions such as “I’ll notify you as soon as the result comes out” or “Please contact me as soon as you arrive,” it is also worth checking 「-는 대로」. Both have a strong sense of immediacy, but 「-는 대로」 more commonly includes the idea of “once this condition is met, proceed with the next step.”

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