데려온 게

the one [someone] brought along

→ 데려오다
phrase Rare #27,689
the one [someone] brought along 게 is a shortened form of 것이, turning the phrase into “the one/thing that was brought along.” The person who brought someone may also be identified from context.
KO: 친구가 데려온 게 강아지였어요.
EN: The one my friend brought along was a puppy.

자넬 여기 데려온 게 누구 지?

Who brought Janelle here?

— 이탈자 (1990)

빌어먹을 놈을 데려온 게 누구 냐?

Who brought that son of a bitch?

— 이탈자 (1990)