Psychopath Diary (2019) character relationship network mapped with AI analysis. Explore the connections, alliances, and conflicts between characters.
Characters
Yook Dong Shik
(played by Yoon Shi-yoon) — protagonist
Yook Dong Shik is a timid analyst at Daehan Securities who cannot confront people who look down on him. After a failed suicide attempt, he witnesses a murder, takes the killer's diary, and loses his m...
Shim Bo Kyung
(played by Jung In-sun) — protagonist
Shim Bo Kyung is a police officer whose patrol car hits Yook Dong Shik after he flees from a murder scene, leaving him with retrograde amnesia. After becoming involved with him and learning about the...
Seo In Woo
(played by Park Sung-hoon) — supporting
Seo In Woo is the director and chairman's son at Daehan Securities, where Yook Dong Shik works. He is revealed to be the heartless psychopath serial killer who loses his murder diary and becomes insec...
Yook Jong Chul
(played by Lee Han-wi) — supporting
Yook Ji Yeon
(played by Hwang Hyo-eun) — supporting
Oh Mi-Joo
(played by Lee Min-ji) — minor
(played by Oh Chae-eun) — cameo
Canonical Relationships
Family, romantic, and professional connections based on plot evidence.
Yook Jong Chul → Yook Ji Yeon
(Family Parent) — Parent-child relationship
Yook Dong Shik → Shim Bo Kyung
(Professional Investigator) — Police officer investigating the case involving Dong-sik
Story Dynamics
Alliances, conflicts, and narrative interactions that evolve throughout the story.
Yook Dong Shik →
(Unknown Possessor) — Possesses the diary that changes his life
Seo In Woo →
(Unknown Owner) — Original owner of the diary with his murder logs
Shim Bo Kyung → Seo In Woo
(Conflict Hunter) — Police officer hunting the serial killer
Yook Dong Shik → Oh Mi-Joo
(Social Friend) — Friend and colleague at work
Yook Dong Shik → Seo In Woo
(Conflict Obsessed Target) — Seo In-woo is obsessed with Dong-sik and is the actual psychopath
Story Analysis
The supplied season context contains two connected blocks of crime narratives: a psychologically unstable investigation followed by a revenge-driven confrontation with a manipulative serial killer.
Plot Progression
The Empathy Investigation
— The opening establishes an investigator whose unusual empathy helps interpret serial crimes. The surviving victim and the cabin evidence broaden the case beyond a single abduction.
Patterns of Violence
— Family murders, ritualized killings, and a recurring stag vision create increasingly disturbing links between the crimes. The discovery of encephalitis turns the investigation toward the investigator'...
Copycats and Hallucinations
— Imitation crimes and organ harvesting complicate the search for the true killer. The investigator's visions, lost time, and contaminated crime scene make professional suspicion increasingly personal.
The False Accusation
— An escaped prisoner, a forced article, and a copycat theory converge on the investigator. The wendigo dream and the discovery of remains lead to arrest and a severe collapse of trust.
The Counterattack
— The later storyline shifts to a manipulated man recovering his memory and identifying the serial killer behind his downfall. A counterplan, hidden hideout, and final stairwell battle bring the season...
