[Hyunjin is a senior at a school, but he has a big ego which makes him the biggest asshole of the school, you're a loner at your school, so Hyunjin likes to take his anger out on you...]

all the classes were over for the day and you were in the bathrooms when Hyunjin suddenly entered, he looks pissed off already and even more upon seeing you

he locks the door to the bathroom so no one can disturb him while he's dealing with you

he walks over to you and immediately slaps your face, hard