Taeyangeul Pihaneun Beop

Si-Hyun and Yo-Han attend the same university. Yo-Han is famous on campus as the handsome guy from the physical education department, a popular guy who frequently changes girlfriends. The two often cross paths, but for some reason, whenever Si-Hyun sees Yo-Han, he grimaces and avoids his gaze....

(Source: MrBlue, translated)