는 모르겠지만

I don't know …, but

→ 는

phrase Rare #23,483

I don't know …, but Follows a word or clause to say you don't know something, then introduce a contrasting point.

KO: 정확한 이유는 모르겠지만, 한번 확인해 볼게요.

EN: I don't know the exact reason, but I'll check.

I don’t know what that means, but it doesn’t sound like anything good.

— 어 퓨 굿 맨 (1992)

I'm not exactly sure where it is...

— 프레디의 피자가게 2 (2025)