Black Out

Same male lead
Same storyline about one being accused for a crime and trying to prove its innocence

Both leads end up being convicted as a murderer in prison. Both have people from their past that fight for them. Both, although different, give a very similar vibe off. The only difference is that while "Black Out" seems to follow the story of the male lead being wrongly accused of murder, "Prison Playbook" is with him truly being the murderer.

When a member of a clergy winds up dead, a temperamental priest and a detective team up to solve the case.

Both MLs are falsely accused of murder with the verdict rushed through by a crooked lawmaker. In both a police detective starts out antagonistic toward the ML and then begins to suspect he's innocent.

There are gonna be shows that are similar plot-wise but VIBE wise this is what this reminds me of. Extremely suspenseful shows with great casting and captivating mysteries. I'd label them "classics" in the kdrama thriller genre. If you enjoy titles like: "Save Me", "Memories of Murder", shoot- even "True Detective Season 1", and dislike shows that drag, have classic kdrama unrealism, or treat their audience like idiots. YOU WILL LOVE THIS SHOW.

Park Ji Hoon uses his intelligence to protect his friends and fight back against the violence that takes place both inside and outside of his school

Both about student life
Blackout is more about past, while Weak hero Class one tells about the present and how friends change overtime

Two friends in the past were victims of serious school bulling. One could not resist his trauma, and becomes a serial killer, walking in the path of revenge. Another one tries his best to overcome the trauma and becomes a police detective. He now faces tragic fate to risk his life to capture the serial killer.