@suna rintarou chapter 2 teacher has an episode where he awakes finding himself ontop of guwon with a knife, seems he has a violent sleep walking problem that hasn't really been addressed yet, just hinted in that chapter as a fluke but now hes doing it again to himself...something with Guwons ring he gave teacher so I think he killed his dad in his sleep. Looks like he might get violent when hes extremely stressed and sleep walking could be from head injury when his dad tried to save him
@StoppingCorpses i like the sleep killing the dad theory, but isn't the teacher was badly injured when some one whack his dad that time? He was so badly injured, he can't even get up..
@Readbymood people sometimes act like normal due to shock sometimes with head injuries and sometimes the adrenaline will keep you awake, fight.or flight and stuff before shock wears off and never know what he did when unconscious