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당신인

that it's you

→ 당신
phrase Rare #23,472
that it's you 당신 means “you,” and 인 is a form of the copula 이다 used before a following noun or phrase. 당신 can sound formal, intimate, or confrontational depending on context.
KO: 목소리를 듣고 당신인 줄 알았어요.
EN: I heard your voice and knew it was you.

당신 인 거 알아요

I know it's you.

— 폴링 다운 (1993)

당신 인 줄 전혀 모르겠네

I had no idea it was you.

— 페인 앤 글로리 (2019)