했을 텐데

would have done; would have said

→ 하다
phrase Rare #28,102
would have done; would have said Expresses a supposition or hypothetical past action, often with an implied contrast or consequence. The exact meaning depends on context.
KO: 들어가지 말라고 했을 텐데.
EN: I would have told you not to go in.

여기 서 떠나라고 했을 텐데!

I told you to leave this place!

— 요짐보 (1961)

들어가지 말라고 했을 텐데

I told you not to go in.

— 러시아 방주 (2002)