Wait they did??!?!
not sure...but thats what i heard
They not dating in high school, they are seniors and juniors, the uke is the senior and they eventually have interaction and became a best friend, but uke furthermore have feelings toward seme, but seme is homophobic so uke is scared that his feeling might broke they friendship. And then they have some conflict and uke transferred to another school (school in manhwa summer time) and seme drop out. And yeah when they meet again they become enemy.
so if the mc and ml dated during their school.days why does the ml hate the mc sm? i mean he obviously like him but why's he acting this way like always mentioning that mc is gay/ slut etc.?!!