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인 것도

also being

→ 이다
phrase Rare #23,667
also being Used after a noun to refer to the fact that someone or something is that noun; 도 adds a sense of “also” or “too.”
KO: 그가 선생님인 것도 몰랐어요.
EN: I didn't know he was a teacher, either.

당신이 정신과 의사 인 것도 몰랐어요

I didn't even know you were a psychiatrist.

— 서스페리아 (1977)