Korean, as well as many other languages, has plenty of euphemisms.
죽다jukda(to die) becomes 돌아가다doragada(to return), 가다gada(to go), 떠나다tteonada(to leave), 잠들다jamdeulda(to sleep), etc.
똥ddong(excrement) becomes 큰 거keun geo(big one) and 오줌ojum(urine) becomes 작은 거jageun geo(small one).
똥 누다ddong nuda(to poop) becomes 볼 일 보다bol il boda(to handle a job) or 화장실 가다hwajangsil gada(to go to bathroom).
화장실hwajangsil(bathroom) itself is a euphemism for 변소byeonso(toilet).
성매매soengmaemae(prostitution) becomes 매춘maechun(selling/buying youth).
This question is too broad for the forum: there are euphemisms in all languages, and providing examples will create a multi-topic thread. I'll have to close this thread. Please make sure to follow the forum rules to avoid closing or deleting any of your posts.