뭘 넣은

what someone put in; what was put in

→ 뭐+를

phrase Rare #32,406

what someone put in; what was put in 뭘 넣은 is a noun-modifying phrase: 뭘 means “what,” and 넣은 means “put in” or “added.” It commonly appears before a noun or in a phrase such as 뭘 넣은 거예요? (“What did you put in?”).

KO: 이 음식에 뭘 넣은 거예요?

EN: What did you put in this dish?