줄 알았습니다

thought that

→ 줄
phrase Rare #30,921
thought that Follows a clause to express what someone thought or assumed was true, often implying it was mistaken.
KO: 오늘이 금요일인 줄 알았습니다.
EN: I thought today was Friday.

부를 줄 알았습니다

I thought you were going to call.

— 다이 하드 (1988)

기타와 바비타는 전쟁에서 이긴 줄 알았습니다

Gita and Babita thought they had won the war.

— 당갈 (2016)

수엘렌이 크리스의 애인 인 줄 알았습니다.

I thought Suellen was Chris’s girlfriend.

저도 죽은 줄 알았습니다

I thought I was dead too.

— 인디아나 존스: 최후의 성전 (1989)