Korean 「반말」 is more complicated than simply removing 「요」 from a sentence. This guide explains the difference between everyday banmal, 「해체」, and 「해라체」, with detailed comparisons of 「-아/어」, 「-야/이야」, 「-니」, 「-냐」, 「-자」, and 「-아라/어라」. It also covers name vocatives, 「말 놓다」, subject honorific 「-시-」 inside banmal sentences, common Korean drama usage, and how Korean casual speech compares with Japanese plain style.