As seen how the 2nd male lead's mother is major part of the poster and second lead having a heart condition i guess jinwoo should somehow be related to 2nd ML and not blood related(beacuse of his dialague with male lead ) to Male Lead and maybe his death has something to do with second lead's heart condition and his mother.
I think there is a little inconsistency here.I think so because the joker when he takes the police chief's grandson he gives the bag which contains exactly what police chief gave to the one who planned the whole escape but now they are saying that yoon jae is the small kid and that he killed them.If yoon jae is joker how did he know what police chief back then gave to the kid who planned the escape.
It is illogical for warden to betray the organisation as he respects no park so much.He even attacks Choi Doha to take revenge,so it is highly illogical for him to work with Choi Doha.My guess is that PCH and warden planned this to get close to Choi Doha while PCH gets close to chairman.