We can't say every such adjective/verb is, but a bunch are. ㅂ irregular conjugation. It's called “ㅂ irregular conjugation (ㅂ 불규칙 활용).” A ... ... <看更多>

ㅂ'불규칙 형용사: 덥다, 춥다, 쉽다, 어렵다, 가볍다, 무겁다, 즐겁다, 가깝다, 맵다, 아름답다, … 5. 'ㅂ'불규칙 동사: 돕다, 굽다, 눕다, 줍다 6. ... <看更多>

For example, 춥다 (to be cold) and 덥다 (to be hot) will be conjugated in the same way as the ㅂ ending verbs. In the standard polite form, it'll be 추워요 ... ... <看更多>