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order of events:
1. a robber breaks into jinwoo's house and hits him in the head. jinwoo's dad fights the robbers off and leaves to get water.
2. jinwoo's dad gets into an altercation with the hounds (assumption--i think jinwoo's dad stole the water bottle from them and they retaliated) and chases him back to his house, where guwon allegedly kills him. jinwoo mixes up the memories of his dad reappearing with the robbers that had previously attacked him due to his head injury and trauma, leading us into the prologue.
3. jinwoo later states that he wanted to confront his missing memories, regardless of how painful they are, because they're still HIS memories. guwon's "gift" to him was helping jinwoo gradually remember what happened that day, which is why he never directly told him (and probably why he allowed jinwoo to return home and followed him).
the MOST IMPORTANT DETAIL is that guwon does NOT explicitly state that he killed jinwoo's dad. both jinwoo and the doc come to their own conclusions, and you could even argue that guwon acted in self defense. the biggest question is still: should we trust jinwoo's memories?
another detail: guwon also states that jinwoo is the only "person" (emphasis) in the whole world that means anything to him, which implies that the hounds are (theoretically) maggots just like him. since both guwon and jinwoo are riding in the back of the truck, we'll probably meet the hound who's driving them back in the final chapter of the season.
and i've said this before: if guwon really did kill jinwoo's dad, his subconscious killing intent probably stems from the fact that his body recognized guwon as his dad's murderer before his brain could.