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때부터

since

→ 때
phrase Common #4,172
since Marks the starting point of a period, often continuing up to the present.
KO: 저는 고등학교 때부터 그를 알았어요.
EN: I've known him since high school.

그는 큰 주인님 때부터 있었죠

He’s been around since the time of the old master.

— 레베카 (1940)