넌 뭐가

what do you…

→ 너+는
phrase Rare #31,038
what do you… 넌 is a casual form of “you” as the topic; the rest of the question determines the exact English wording.
KO: 넌 뭐가 먹고 싶어?
EN: What do you want to eat?

넌 뭐가 되고 싶니?

What do you want to be?

— 중앙역 (1998)

넌 뭐가 되고 싶었어?

What did you want to be?

— 파이트 클럽 (1999)

넌 뭐가 싫어?

What do you hate?

— 인생은 아름다워 (1997)