끝났다고

끝났다고

"It is over" or "It ended."

Here, '끝났다고' is used to indicate reported speech, meaning someone mentioned that something (the project) has been completed.

그 프로젝트가 끝났다고 들었어요.

I heard that the project is finished.

'끝났다고' explains the situation that led to the students leaving, emphasizing the temporal sequence.

학교에서 수업이 끝났다고 학생들이 떠났어요.

After the lesson ended at school, the students left.

In this sentence, '끝났다고' expresses a subjective thought or assumption that the rain was over.

비가 끝났다고 나가려고 했어요.

I was planning to go out, thinking the rain had stopped.