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안 했는지

whether ... didn’t

→ 안
phrase Rare #26,416
whether ... didn’t Used to express uncertainty about whether someone did not do something. In context, it can also mean “why [someone] didn’t …”
KO: 숙제를 안 했는지 확인해 봐.
EN: Check whether they didn’t do the homework.

그럼 전화를 했는지 안 했는지 어떻게 아시오?

Then how do you know whether or not he called?

— 싸이코 (1960)

집에 전화 안 했는지 몰랐어요

I didn't know you hadn't called home.

— 히든 (2005)

왜 이야기 안 했는지 얘기해 줄게.

I'll tell you why I didn't say anything.

— 퍼펙트 스트레인저 (2016)