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를 찾을 때까지

until (someone or something) is found

→ 를
phrase Rare #31,344
until (someone or something) is found The object particle 를 marks what is being searched for; the phrase follows that object. The subject doing the searching is understood from context.
KO: 열쇠를 찾을 때까지 계속 찾아볼게요.
EN: I’ll keep looking until I find the keys.

부모를 찾을 때까지 요

Until we find their parents.

— 카쉬미르의 소녀 (2015)

아뇨, 브로디를 찾을 때까지 죽이면 안 돼요

No, don’t kill him until we find Brody.

— 인디아나 존스: 최후의 성전 (1989)