Feel free to discuss your theories here. (Not any spoilers, just my personal theories)
Im thinking its either his dad was actually a bad guy and was about to kill him for some reason? Or infected already and was going to kill MC and Guwon saved him. Or bro went batshit crazy from like a concussion or something, killed his dad, woke up from his mental state and because his brain still wobbly he thinks its Guwon
(text replies come back when you comment again like you did, good to know!!)
The reason *could* be that he has severe PTSD which his nightmares seem to hint at. And maybe the nightmares are an event we don't know yet. But for Guwon he doesn't need a reason as he's proved with others, he kills anyone he deems as not useful including the doctors wife and kids. I don't think he did it though because that wouldn't be much of a twist and the author seems better than that lol
Seeing guwon and what he said to teach about the "dog thing" it wouldn't seem surprising to me if guwon was the one who actually killed his father.. he said that teach seemed to him like the others at first but then different... So maybe he killed his dad and later on fell for jinwoo? god damn I don't know anymore just pack it up lil bro's











Feels like its been years wtf