오해가 · 오해를
misunderstanding
Example
친구와 작은 오해가 생겨서 마음이 안 좋아요.
I had a small misunderstanding with my friend, so I feel bad.
Word parts
오 mistaken+해 understand
Literally 'mistaken understanding'.
Good to know
A misunderstanding 'happens' with 오해가 생기다 and is cleared up with 오해를 풀다.