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있었던 일을

what happened

→ 있다
phrase Rare #32,062
what happened Refers to an event or events that took place in the past; 을 marks it as the object of the sentence.
KO: 어제 있었던 일을 기억해요.
EN: I remember what happened yesterday.

그날 있었던 일을 말해 줘요

Tell me what happened that day.

— 피케이: 별에서 온 얼간이 (2014)