뭣 때문에

why

→ 무엇
phrase Rare #25,893
why Literally means “because of what” and is used to ask the reason for something.
KO: 뭣 때문에 그렇게 화가 났어요?
EN: Why are you so angry?

자네들을 도우려고 비행기까지 타고 왔는데 뭣 때문에?

I even flew here to help you guys, so what’s the problem?

— 미스터 헐리웃 (2000)