Character Relationship Map: I Saw the Devil

Characters

• Kyung-chul (played by Choi Min-sik) — protagonist

  Serial killer and school bus driver who murders the victim and scatters her remains. Evades police, survives multiple assaults by the agent, plants a tracker on a taxi driver, kills the victim's fathe...

• Squad Chief Jang (played by Jeon Kuk-hwan) — supporting

  Victim's father who leads the police search alongside Squad Chief Oh. Provides suspect information to the agent and is later brutally assaulted and killed by the serial killer while trying to protect...

• Section Chief Oh (played by Cheon Ho-jin) — supporting

  Police squad chief who co-leads the initial investigation and search for the dismembered victim alongside Squad Chief Jang.

• Se-jung (played by Kim In-seo) — supporting
• Kyung-chul's Son (played by Jang Jeong-won) — minor
• Section Chief's Daughter (played by Nam Bo-ra) — supporting

  Refers to Squad Chief Jang's daughter, identified in the plot as Jang Se-yun. She is targeted and killed by the serial killer to disrupt the agent's pursuit.

• NIS Agent (played by Lee Jun-hyuk) — supporting

  Refers to the agent's trusted subordinate. He assists both the agent and the serial killer with hospital treatment and helps them evade police custody, enabling the continuation of their private tortu...

• Tae-joo (played by Choi Moo-seong) — supporting

  Friend of the serial killer and a cannibalistic murderer. He hosts the killer, gets caught in the crossfire, is arrested by police, and reveals crucial information about the killer's next targets befo...

• Section Chief Oh's Wife (played by Nam Hyeon-joo) — cameo
• Kyung-chul's Mother (played by Son Young-soon) — cameo

Canonical Relationships

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

• Section Chief Oh's Wife → Section Chief Oh (wife)

  角色名包含关系词: wife

• Kyung-chul's Mother → Kyung-chul (mother)

  角色名包含关系词: mother

• Kyung-chul's Son → Kyung-chul (son)

  角色名包含关系词: son

• Section Chief's Daughter → Section Chief Oh (daughter)

  角色名包含关系词: daughter

• Squad Chief Jang → NIS Agent (Professional Investigation Contact)

  Squad Chief Jang provides the agent with information about the suspects connected to the victim's murder.

• Tae-joo → Se-jung (Romantic Girlfriend)

  The plot identifies Se-jung as Tae-joo's girlfriend when Kyung-chul visits Tae-joo's home.

Story Dynamics

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

• Se-jung → NIS Agent (Conflict Hostile Encounter)

  The agent arrives at Tae-joo's home and incapacitates Tae-joo and Se-jung during the confrontation.

• Tae-joo → NIS Agent (Narrative Information Source)

  The agent questions Tae-joo in the hospital and learns that Kyung-chul is targeting Squad Chief Jang and another family member.

• NIS Agent → Kyung-chul (Conflict Tormentor)

  The agent tracks Kyung-chul with a swallowed transmitter, fractures his arm, attacks him repeatedly, and cuts his Achilles tendon.

• Kyung-chul → Se-jung (Social Acquaintance)

  Kyung-chul meets Se-jung at Tae-joo's home, where she appears nonchalant about his arrival.

• Kyung-chul → Squad Chief Jang (Conflict Enemy)

  Squad Chief Jang leads the police search after the remains are discovered. Kyung-chul later brutally assaults and kills him at his home.

• Kyung-chul → Tae-joo (Social Friend)

  Kyung-chul visits Tae-joo's home after being attacked, and Tae-joo comments on the identity and motives of the person tormenting him.

Story Analysis

A killer and his pursuer become trapped in an escalating cycle of cruelty that turns revenge into another form of devastation.

Plot Progression

1. Murder And Investigation
2. The Tracker Of Vengeance
3. Violence Without Escape
4. The Killer Strikes Back
5. The Cost Of Revenge