짝사랑이 · 짝사랑을
unrequited love, one-sided crush
Example
저는 고등학교 때 한 선배를 오래 짝사랑했어요.
In high school, I had a crush on an older student for a long time.
Word parts
짝 'one of a pair' + 사랑 'love': love coming from just one side.
Good to know
Use 짝사랑하다 as a verb: 누구를 짝사랑하다 means to secretly love someone who doesn't love you back.
Related words