Taeu and Jieun are friends—just friends. Both of them were comfortable with this arrangement, with neither holding any romantic feelings for the other. However, when Jieun returns from summer break looking noticeably different, Taeu's feelings for his friend begin to change, and new feelings of jealousy and confusion taking their place. When Jieun develops a crush on a handsome classmate, things start to get even more complicated between the two of them as Taeu begins to try to beat out his new competitor and take his longtime friendship with Jieun to the next level.