한 짓은

what someone did

→ 하다
phrase Rare #26,161
what someone did Refers to a person's actions, often with a negative or disapproving nuance. 한 indicates that the act was done, and 은 marks the phrase as the topic.
KO: 네가 한 짓은 정말 실망스러워.
EN: What you did is really disappointing.

그래도 그가 한 짓은 용서할 수 없어

Even so, I can't forgive what he did.

— 귀향 (2006)

내가 한 짓은 정말 미안해 알겠지?

I'm really sorry for what I did, okay?

— 빅 식 (2017)