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줄 몰랐는데

didn't know that

→ 줄
phrase Rare #27,793
didn't know that Used after a clause to say you didn't know or realize something. The ending -는데 can make the statement sound like background information or a gentle contrast.
KO: 네가 한국어를 배우는 줄 몰랐는데.
EN: I didn't know you were learning Korean.

네가 올 줄 몰랐는데

I didn't expect you to come.

— 사랑해 줘 사랑해 줘 (2026)

어디 가는 줄 몰랐는데

I didn’t know where you were going.

— 잉글리쉬 페이션트 (1996)