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날 밤

the night of [a day or event]

→ 날
phrase Rare #20,212
the night of [a day or event] With 어느, 어느 날 밤 means “one night.”
KO: 이사 날 밤에 친구들이 왔어요.
EN: Friends came the night we moved.

장 선 꼭 이런 날 밤 이었네.

So that's why it had to be a night like this.