V-는 줄 모르고
This pattern is used after a verb stem to mean “without realizing that ...,” often because someone is so absorbed in one activity that they do not notice another situation, such as time passing. It is reusable in contexts like conversations, reading, or watching something for a long time. Example: 그는 전시를 보다가 시간이 가는 줄 모르고 한참을 머물렀다.
그는 전시를 보다가 시간이 가는 줄 모르고 한참을 머물렀다.
He looked at the exhibition and stayed for a long time without realizing how time was passing.
