Ngl this has gotta be the most rushed ending I've ever read Isaac being the killer makes no sense as there are instances where Isaac was busy while the killer was killing second of all Isaac looks completely different compared to the actual killer where one looks older than him or the one who killed his step brother or whoever tf that guy was has completely different hair and facial features compared to Isaac so I'm co voices the author didn't want to continue thsi manhwa so just rushed the ending