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게 뭔지

what … is

→ 것+이
phrase Rare #20,390
what … is 게 is a shortened form of 것이, and 뭔지 means “what.” The phrase introduces an indirect question about what something is or what someone wants, needs, or considers important.
KO: 네가 걱정하는 게 뭔지 말해 줘.
EN: Tell me what you’re worried about.

집에서 당신이 필요한 게 뭔지 알겠어요?

Do you know what you need at home?

— 이탈자 (1990)