Character Relationship Map: The Prison

Characters

• Jung Ik-ho (played by Han Suk-kyu) — protagonist

  Undisputed power and kingpin within the prison, ruling an underworld where inmates commit perfect crimes at night. He recruits the newly incarcerated Song Yoo-gun into his criminal schemes, revealing...

• Song Yoo-gun (played by Kim Rae-won) — protagonist

  Former police officer with a 100% arrest rate, incarcerated for hit-and-run, evidence tampering, and bribery. Known for his fearless attitude and hot-tempered nature, he quickly attracts the attention...

• Prisoner (played by Jong Ho) — minor
• Jang Min-gi (played by Na Kwang-hoon) — minor

Canonical Relationships

Family, romantic, and professional connections based on plot evidence.

• Jung Ik-ho → Prisoner (Power Kingpin And Operative) — Jung exercises authority over prisoners involved in specialized criminal operations, using the prison as the center of an underground network.

  Jung Ik-ho is described as a powerful prison figure surrounded by inmates who participate in illicit operations arranged from inside the prison.

Story Dynamics

Alliances, conflicts, and narrative interactions that evolve throughout the story.

• Jung Ik-ho → Jang Min-gi (Unknown Suspected Network Connection) — The provided plot links their narrative spheres through the broader criminal scheme, but does not establish direct contact or responsibility between them.

  Jang Min-gi is found dead during a scheme surrounding the Woo-Myung Group, while Song Yoo-gun suspects that crimes outside prison are connected to Jun...

• Song Yoo-gun → Jang Min-gi (Narrative Investigator And Victim) — Although the plot provides no direct personal contact between them, Jang's death becomes an investigative lead in Song's attempt to uncover the larger criminal network.

  Jang Min-gi's death becomes part of the tax-evasion investigation that Song Yoo-gun later suspects is connected to crimes organized through the prison...

• Song Yoo-gun → Prisoner (Conflict Former Arresting Officer And Inmate) — Their shared confinement reverses Song's former law-enforcement authority and creates an immediate source of tension inside the cell.

  Song Yoo-gun, a former police officer, shares a cell with a man he once arrested.

• Jung Ik-ho → Song Yoo-gun (Coercive Alliance Turned Conflict) — Jung initially draws Song into his criminal network, but their relationship becomes adversarial as Song investigates the prison's connection to outside crimes.

  Jung Ik-ho becomes interested in the newly incarcerated Song Yoo-gun and recruits him into prison-based criminal schemes. Later, Jung and his associat...

Story Analysis

A former police officer enters a prison-controlled criminal network and risks his life to uncover how its operations connect to crimes outside.

Plot Progression

1. A Death Without Answers — Jang Min-gi is found dead in a Seoul hotel during a tax-evasion scheme. The apparent overdose makes the investigation seem likely to stall.
2. The Prison Kingpin — Song Yoo-gun enters prison and encounters a former arrestee as a cellmate. He soon discovers that Jung Ik-ho commands inmates involved in organized illicit operations.
3. Suspicion Takes Root — Violence and suspicious deaths make Song suspect that prison activities are connected to crimes outside. The investigation lacks proof, leading Song to propose a deeper infiltration.
4. The Informant Hunt — Song becomes increasingly endangered as loyalties shift and Jung's circle searches for an informant. The conflict spreads beyond prison while officials consider withdrawal.
5. Confrontation Without Closure — Song faces hostile men and declares that he expected to die when he entered prison. The provided ending leaves the investigation and the characters' fates unresolved.