해줬잖아

did (something) for (someone), remember?

→ 해주다
해 do; perform + 줬 Past tense + 잖아 Reminding / shared knowledge
verb · informal, past tense Rare #28,076
did (something) for (someone), remember? The ending 잖아 reminds the listener of something they are expected to know.
KO: 내가 그거 해줬잖아.
EN: I did that for you, remember?
Conjugation of 해주다

내 얘기는 다 해줬잖아

I've already told you everything.

— RRR: 라이즈 로어 리볼트 (2022)