걸 거야

must have; probably did; will be (in a conversational construction)

→ 것+을

phrase Rare #24,719

must have; probably did; will be (in a conversational construction) A conversational ending used for a confident assumption or prediction. In a form such as 꾼 걸 거야, it means “must have had/done.” It is an informal contraction related to 것일 거야.

KO: 그는 악몽을 꾼 걸 거야.

EN: He must have had a nightmare.

술 먹고 이러는 걸 거 야

Are you acting like this because you’re drunk?

— 컨트롤 (2007)

의사 한테 걸 거 야

I'm going to call the doctor.

— 저수지의 개들 (1992)