않았단

않았단

"않았단" is a contracted form meaning "didn't" or "hadn't" in Korean, often used in informal speech.

않았단 here denotes quoting the past tense negative statement about an event.

그는 시험에 떨어지지 않았단 말을 들었다.

He heard the words that he didn't fail the exam.

In this sentence, 않았단 is used to denote a reference to a past negative state, preserved in documentation.

그 프로젝트가 끝나지 않았단 기록이 남아있다.

There exists a record that the project wasn't completed.

않았단 in this sentence indicates the past tense negative conjugation with quotation or referencing the fact.

나는 그 책을 읽지 않았단 사실을 알고 있었다.

I knew the fact that I hadn't read that book.