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떠났을 때

when someone left

→ 떠나다
phrase Rare #22,569
when someone left Formed from 떠나다 (to leave) in the past tense plus 을 때 (when). The subject is understood from context.
KO: 제가 떠났을 때는 모두 자고 있었어요.
EN: When I left, everyone was asleep.

내 아내가 떠났을 때…

When my wife left…

— 영원 (2025)

그녀는 우리가 막 떠났을 때 도착했다.

She arrived just as we were leaving.

우리가 떠났을 때 그대로 야

It’s exactly as it was when we left.

— 반딧불의 묘 (1988)