그걸 누가

who would

→ 그것+을
phrase Rare #15,969
who would Used at the beginning of a rhetorical question meaning “who would know/do/like that?” depending on the following verb. 그걸 means “that” or “that thing,” and 누가 means “who.”
KO: 그걸 누가 믿겠어?
EN: Who would believe that?

그걸 누가 좋아해?

Who likes that?

— 영원 (2025)

그걸 누가 안다고 그래

Who would know that?

— 리턴 (2003)

그걸 누가 가르쳐 줬어요?

Who taught you that?

그걸 누가 몰라요?

Who doesn't know that?

— 스파이더맨: 뉴 유니버스 (2018)

불평하는 거 싫어 그걸 누가 좋아해?

I hate complaining, who likes that?

— 영원 (2025)