왜 니가

why are you the one

→ 왜
phrase Rare #16,445
why are you the one An informal, conversational form of 왜 네가. Used to question why the listener is doing something or why they are involved, often with surprise, criticism, or disbelief. 니가 is a common colloquial spelling of 네가.
KO: 왜 니가 이 일을 결정해?
EN: Why are you the one deciding this?

그런데 칼은 왜 니가 가지고 있지?

But why do you have a knife?

— 조조 래빗 (2019)

왜 니가 말을 하냐

Why are you doing all the talking?

— 헤어질 결심 (2022)

왜 니가 받아?

Why are you taking it?

— 부산행 (2016)