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때문이었어

it was because of

→ 때문
phrase Rare #18,579
it was because of A casual expression meaning that something happened or was the case because of a particular person or thing. Often used in questions as “was it because of...?”
KO: 네가 도와줬기 때문이었어.
EN: It was because you helped me.

죄책감 때문 이었어

It was because I felt guilty.

— 잠수종과 나비 (2007)

사부님의 말씀 때문 이었어

It was because of what my master said.

— 패왕별희 (1993)