The studious Kim Haneul's life changed one night when she decided to sneak out on a whim. In the twilight, she meets a group of delinquents, Byun Baekhyun, Park Yoonji, and Oh Sehun. Initially wary of eye-catching the group, she changes her mind when the popular Baekhyun helps her out in a moment of need. Finding solace in each other, the two gradually begin to fall in love. Tragedy strikes however, setting off a chain of events that soon threaten the groups of friends, and the life they thought they knew so well.