였을까

was ...?; could ... have been?

→ 이다
였 Past tense + 을 Future attributive + 까 Wondering or deliberative question ending
auxiliary · past tense Rare #20,878
was ...?; could ... have been? Used in a question when wondering or speculating about what something or someone was.
KO: 그 사람은 의사였을까?
EN: Was that person a doctor?
Conjugation of 이다

정말 나 였을까?

Was it really me?

— 20th Century Girl (2022)

그 산의 우리는 누구 였을까?

Who were we on that mountain?

— 안데스 설원의 생존자들 (2023)

정말 종이 였을까?

Was it really paper?

언제부터 난 타일러 였을까?

Since when was I Tyler?

— 파이트 클럽 (1999)