실수한 거야

you made a mistake

→ 실수하다
phrase Rare #28,820
you made a mistake A casual way to state or emphasize that someone made a mistake; who made the mistake is understood from context.
KO: 이번에는 내가 실수한 거야.
EN: This time, I’m the one who made a mistake.

근데 말 이야 너 실수한 거 야

But, you know, you made a mistake.

— I Saw the Devil (2010)

실수한 거 야

Did you make a mistake?

— 아메리칸 갱스터 (2007)

네가 실수한 거 야

You made a mistake.

— 퍼니 게임 (1997)