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문제가 아냐

not the problem, it's not a problem

→ 문제
phrase Rare #23,563
not the problem An informal form meaning that something is not the issue or main difficulty. 아냐 is the informal spoken form of 아니야.
KO: 돈이 문제가 아냐. 시간이 없어.
EN: Money isn't the problem. We don't have time.

시간이 문제가 아냐

Time isn't the issue.

— 마션 (2015)

네 생각처럼 간단한 문제가 아냐

It's not as simple a problem as you think.

— 해리 포터와 불사조 기사단 (2007)

phrase Rare #23,564
it's not a problem A colloquial form of 문제가 아니야. It can also mean “that's not the issue” or “it's not something...” depending on context.
KO: 그건 네가 걱정할 문제가 아냐.
EN: That's not something you need to worry about.

연기 방법이 문제가 아냐

The way you act isn't the problem.

— 멀홀랜드 드라이브 (2001)

그게 문제가 아냐

That's not the problem

— 오펜하이머 (2023)

그런 문제가 아냐!

That's not the problem!

— 보리밭을 흔드는 바람 (2006)