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뭘 봤는지

what you saw

→ 뭐+를
phrase Rare #21,144
what you saw Used in an embedded question about what someone saw. 뭘 is a contraction of 무엇을, meaning “what,” and 봤는지 marks the past action as something being asked or wondered about.
KO: 어젯밤에 뭘 봤는지 말해 줘.
EN: Tell me what you saw last night.

내가 위층에서 화장실 말고 또 뭘 봤는지 알아?

You know what else I saw upstairs besides the bathroom?

— 귀향 (2006)

거기 서 뭘 봤는지 궁금하지 않아?

Aren't you curious what you saw there?

— 스파이더맨: 뉴 유니버스 (2018)

딤섬 식당 뒤에서 네가 뭘 봤는지는 몰라도 난 괴물 같은 거 죽인 적 없어.

I don't know what you saw behind the dim sum restaurant, but I've never killed a monster or anything.

— 더스트 버니 (2025)