일어나지 않은

that didn't happen

→ 일어나다
phrase Uncommon #12,649
that didn't happen 일어나다 can also mean “to get up,” depending on context.
KO: 그건 아직 일어나지 않은 일이야.
EN: That’s something that hasn’t happened yet.

왜 이젠 일어나지 않은 과거를 기억하는 거 죠?

Why do we remember the past that never happened?

— 폭풍의 시간 (2018)

“일어나지 않은 일을 계속 떠올리지 않게 해 줄 거 예요.”

It’ll help you stop dwelling on things that haven’t happened.