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시간엔

at that time, during that time

→ 시간+에는
시간 time + 엔 Locative topic marker
noun Rare #31,096
at that time, during that time A contraction of 시간에는; -에는 means “at/in” with a contrastive or topical nuance.
KO: 이 시간엔 보통 집에 있어요.
EN: I’m usually at home at this time.

그 시간엔 못 나와

I can't come out at that time.

— 학이 난다 (1957)

영업 시간엔 오지 말라니까 위험해

I told you not to come during business hours—it’s dangerous.

— 라따뚜이 (2007)