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인 걸요

it is, you know; it’s actually

→ 이다
phrase Rare #24,865
it is, you know; it’s actually A gently emphatic, polite ending used to explain or correct something. 인 걸요 follows a noun or noun phrase.
KO: 아주 오래전 일인 걸요.
EN: It was a very long time ago, you know.

천만에요, 진품 인 걸요

You're welcome—it’s the genuine article.

— 희생 (1986)