Seeing a fan mentioned about how Yoowon gots into an accident(in the end of season 2) which damaged his head so his memory changed or something like that and what he remembered was Dohoon was bullied but the truth is he was the one who was bullied and Doohon was trying to help him
Your theory about Yoowon was the one who killed and Doohon took the blame for him or Doohon did in fact kill the bully because Yoowon told him but he himself didn’t remember due to head trauma from the accident
Ngl, I didn’t know about the accident, but I thought they both committed the murders together. It seems Doohon just took the blame and Yoowon was the one who committed them idk :)
So all this time Yoowon was the one being bullied as well, but he only remembered Dohoon being bullied? Because that would explain him saying “it’s different” from referring to the office bullying and school past. Since we can’t fully trust our MC’s memories and perspective, I think Yoowon could’ve been also part of the murders, but can’t remember!! Him being also bullied would give him motive. Idk just a thought