있을 줄 알았는데

thought [it] would be, but...

→ 있다

phrase Uncommon #9,119

thought [it] would be, but... Expresses an expectation or belief that something would exist or be somewhere; the ending often sets up a contrast with what actually happened.

KO: 네가 여기 있을 줄 알았는데.

EN: I thought you’d be here, but…

우리 에게 조금 더 시간이 있을 줄 알았는데.

I thought we would have a little more time.

— 듄 (2021)