This convo has to have been going for a while, how is no one concerned that Haejoon is still bleeding. Like. The teacher should at least give an apology (among other things). Literally if Haejoon went to the hospital and truthfully answered how he got this HEAD INJURY, the news would probably blow up online
BTW if you are in a private school and are ever are in a situation where a teacher physically harms you in any way that needs assistance, try to get to an actual hospital instead of your school infirmary (assuming it isn't something that needs immediate professional care). The school will try to cover it up to save their asses. Anything that would risk school reputation, really