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인 줄 알고

thinking that it was

→ 이다
phrase Rare #26,693
thinking that it was Used when someone acts or reacts based on a mistaken assumption. The noun before 인 줄 알고 is what they think something is.
KO: 그가 선생님인 줄 알고 인사했어요.
EN: I greeted him, thinking he was a teacher.

레즈닉 씨 미안해요, 도둑 인 줄 알고 사람 놀라게 하긴

Sorry, Mr. Resnick. I thought you were a thief, so I startled you.

— 머시니스트 (2004)

그냥 경고 인 줄 알고 뭐 야 도대체

I thought it was just a warning. What the heck is this?

— 라라랜드 (2016)