줄 몰랐어

didn't know how or that

→ 줄
phrase Very common #1,079
didn't know how or that Used after a verb to express not knowing how to do something or not knowing that something was the case. The polite form is 줄 몰랐어요.
KO: 네가 피아노를 칠 줄 몰랐어.
EN: I didn't know you could play the piano.

이걸 다시 볼 줄 몰랐어

I never thought I’d see this again.

— 크리에이터 (2023)

돌아온 줄 몰랐어

I didn't know you were back.

— 폭풍의 시간 (2018)

그런 줄 몰랐어

I didn't know that.

— 크리에이터 (2023)

네가 그 차에 있는 줄 몰랐어!

I didn't know you were in that car!

— 나우 유 씨 미 3 (2025)

나도 이럴 줄 몰랐어

I didn’t expect this either.

— 해피 투게더 (1997)

자넨 줄 몰랐어

I didn't know it was you.

— 무인 곽원갑 (2006)

네가 오는 줄 몰랐어.

I didn't know you were coming.

미안해, 너희 줄 몰랐어

Sorry, I didn’t know I was your meal.

— 마녀배달부 키키 (1989)