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를 마친

having finished

→ 를
phrase Rare #25,059
having finished Follows a noun marked as the object and often appears before words meaning “after” or “next.”
KO: 회의를 마친 뒤 집에 갔어요.
EN: After finishing the meeting, I went home.

학교를 마친 뒤에는 무엇을 할 생각 입니까?

What do you plan to do after you finish school?

— 엘리트 스쿼드 (2007)