Lee Changsub is Yook Sungjae's persistent admirer for three years. To say that he hates the older is an understatement. Things get worse when their professor wants him to tutor Changsub. Everyday he tells him to leave him alone but the older just won't listen. Eventually, he gave up on telling him that. Maybe he actually enjoys the other's company? Maybe he likes the way Changsub smiles at him? He doesn't really know.

Until one day, Lee Changsub decides to tell him that he's finally giving up on him. The jerk even had the guts to pat his shoulder and smile at him!

Yook Sungjae should be the happiest person right at that moment. So he doesn't get why he's standing at Lee Changsub's front door at 3:00 am because he cannot freaking sleep unless... the older takes back what he said to him that day.