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아무 일도 없던

as if nothing had happened

→ 아무
phrase Uncommon #8,260
as if nothing had happened The ending -던 describes a past situation or something remembered. The phrase can also mean that nothing had happened, depending on the rest of the sentence.
KO: 아무 일도 없던 것처럼 웃었어요.
EN: I smiled as if nothing had happened.

아무 일도 없던 것 같아

It seems like nothing happened.

— 서스페리아 (1977)

아무 일도 없던 게 된다고

That it would be as if nothing had happened.

— 불릿 트레인 (2022)