Good guy that gets framed and goes to prison, he changes into a powerful guy. It’s Law drama as well. Lots of murder and corruption.
Recommended by kdramablossoms16
The main lead had an accident and he is forced to quit working at a hospital after being accused of medical malpractice. He starts working in a prison with the goal of acquiring enough connections to take his revenge.
Recommended by Bozzmoms
-MC ends up in prison
-MC is innocent but becomes savage
-MC shares a cell with one of the inmates who is also an inmate here in the Insider
-Satisfying plot
-wrongly accused in both
Recommended by CelestialxWolf
If you were really into the card playing of INSIDER, you might also enjoy KAKEGURUI for the same reason.

KAKEGURUI follows a bunch of rich high schoolers who spend all their time conning each other in different types of traditional games. It's almost similar to a prison (quite like the one in INSIDER) where certain characters are treated horribly and second-class citizens and have to do horrible things. It also has its comedic moments, since the FL is a new student who is able to outsmart all the con artists like the ML was able to do in INSIDER.
Recommended by mya
Something to check out if you like the prison arc from INSIDER.

Both follow MLs who are put into prison. Whilst the ML from INSIDER is innocent. the ML in ONE ORDINARY DAY has been arrested for something he doesn't remember. Both MLs are trying to find out the truth and both of them get close to the top dogs of the prison and they look out for them throughout both dramas (kind of...)
Recommended by mya
- The plot is similar as it gives the similar vibes
- Only difference in Insider is that ML is an Undercover Judicial Trainee for investigation in crime and gambling world
- ML tries his level best to catch criminals before his identity getting exposed
Recommended by Selby Thomas
"Insider" Kim Yo Han, a judicial trainee who will go undercover in an investigation but will suddenly face a crisis and will be in prison. He will do his best in order to change his fate while in prison.

"The Devil Judge", Kang Yo Han aura and merciless way of punishing the guilty, dishonest criminals who face his trials, create a different dimension of coexistence between good and evil within a court.
Recommended by nananur
Slight spoiler: ML puts himself in jail so he can reach a specific goal. Power struggle, corruption, gore&violence, prison life
Recommended by Kapetria
I think the plot is quite similar to this movie
- ML goes to prison as Undercover for investigation
- Faces many obstacles & needs to survive in the prison with other criminals
- Finding truth about the investigation he's doing
Recommended by Selby Thomas

- ML goes to prison as Undercover for investigation/be friendly with other Criminal King inmate
- Faces many obstacles & needs to survive in the prison with other criminals
- Finding truth about the investigation he's doing
Recommended by Selby Thomas
Beaten down Male Lead who exacts revenge in prison

Lots of Gambling Scenes with Brawling Scenes

Tragic circumstances push the Male Lead to a place of no coming back
Recommended by howyoulikethat
Both MLs have occupations dealing with the judicial system. They were both influenced greatly by their deceased parent, and were orphaned at a young age. Both have strong values and morals.

Strong FL is here as well. Surrogate father/father figure impacts/influences their beliefs and decisions and an incident involving them influences ML to make a big decision and take action.
Recommended by yannie_alienates
Similar Noir Crime Vibes

Male Lead that can fight

Both became who they were to bad circumstances or events in life

Revenge based drama
Recommended by howyoulikethat
Insider (2022) poster

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