제가 뭘

what should I...

→ 저
phrase Uncommon #11,381
what should I... A polite phrase meaning “what should I...?”, “what did I...?”, or “what am I...?” depending on the following verb and context. 제가 means “I,” and 뭘 is the contracted form of 무엇을, meaning “what.”
KO: 제가 뭘 준비하면 될까요?
EN: What should I prepare?

아니요, 제가 뭘 했다고요

No, what did I do?

— 동경 이야기 (1953)

제가 뭘 들고 있죠?

What am I holding?

— 8과 1/2 (1963)

제가 뭘 했다고요?

What did I do?

— 아마코드 (1973)

제가 뭘 잘못 말했나요?

What did I say wrong?

— 사랑해 줘 사랑해 줘 (2026)

제가 뭘 했으면 좋겠어요?

What do you want me to do?

— 달콤한 인생 (1960)

제가 뭘 할 건지 말씀드리죠

Let me tell you what I'm going to do.

— 데드맨스 와이어 (2026)