누가 알겠어요

who knows

→ 누구+가
phrase Rare #17,646
who knows A rhetorical expression meaning that something is uncertain or impossible to know. The ending -겠어요 makes it polite; it is not necessarily a literal question about who knows.
KO: 내일 비가 올지 누가 알겠어요?
EN: Who knows if it will rain tomorrow?

누가 알겠어요

Who knows?

— 토니 에드만 (2016)

하긴 누가 알겠어요?

Well, who knows?

— 부고니아 (2025)

어디 있는지 누가 알겠어요

Who knows where it is?

— 내 어머니의 모든 것 (1999)

당신이 날 어떻게 생각하는지 누가 알겠어요, 교수님?

Who knows what you think of me, Professor?

— 순응자 (1971)

바람의 방향을 누가 알겠어요?

Who knows which way the wind blows?

— 연인 (2004)