Yeojasaramchingu

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

(Source: WEBTOONS)