Story Structure — 6 Plot Phases
The Timid Analyst
Dong-sik lives a timid life as an analyst at Daehan Securities, unable to stand up for himself.
Key Events
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Suicide Attempt — Dong-sik attempts suicide but fails Characters: Yook Dong Shik
Location: Unknown location
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Witnesses Murder — Dong-sik witnesses a murder by Seo In-woo Characters: Yook Dong Shik, Seo In Woo
Location: Street
Life-Changing Discovery
After witnessing a murder and finding the psychopath's diary, Dong-sik is hit by a car and develops amnesia.
Key Events
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Witnesses Murder — Dong-sik witnesses a murder by Seo In-woo Characters: Yook Dong Shik, Seo In Woo
Location: Street
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Finds Diary — Dong-sik picks up the murderer's diary Characters: Yook Dong Shik
Location: Crime scene
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Hit by Car — Dong-sik is hit by Bo-kyung's patrol car Characters: Yook Dong Shik, Shim Bo Kyung
Location: Street
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Develops Amnesia — Dong-sik suffers from retrograde amnesia Characters: Yook Dong Shik
Location: Hospital
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Believes He's Psychopath — Dong-sik thinks he's the psychopath due to the diary Characters: Yook Dong Shik
Location: Home
False Identity
Believing he's a psychopath due to the diary, Dong-sik's behavior begins to change dramatically.
Key Events
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Believes He's Psychopath — Dong-sik thinks he's the psychopath due to the diary Characters: Yook Dong Shik
Location: Home
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Behavior Changes — Dong-sik's behavior starts changing at work Characters: Yook Dong Shik, Oh Mi-Joo, Shim Bo Kyung
Location: Daehan Securities
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Bo-kyung Investigates — Bo-kyung decides to catch the serial killer Characters: Shim Bo Kyung
Location: Police Station
The Hunter's Pursuit
Police officer Bo-kyung gets involved in the case, determined to catch the serial killer.
Key Events
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Bo-kyung Investigates — Bo-kyung decides to catch the serial killer Characters: Shim Bo Kyung
Location: Police Station
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Seo Loses Diary — Seo In-woo loses his diary after 6th murder Characters: Seo In Woo
Location: Street
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Seo Becomes Obsessed — Seo In-woo becomes obsessed with Dong-sik Characters: Seo In Woo, Yook Dong Shik
Location: Daehan Securities
Psychopath's Obsession
The real psychopath, Seo In-woo, becomes obsessed with Dong-sik after losing his diary.
Key Events
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Seo Becomes Obsessed — Seo In-woo becomes obsessed with Dong-sik Characters: Seo In Woo, Yook Dong Shik
Location: Daehan Securities
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Identity Revealed — Seo In-woo is revealed as the psychopath Characters: Seo In Woo, Shim Bo Kyung, Yook Dong Shik
Location: Daehan Securities
Truth Revealed
Seo In-woo's identity as the psychopath is revealed, leading to a final confrontation.
Key Events
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Identity Revealed — Seo In-woo is revealed as the psychopath Characters: Seo In Woo, Shim Bo Kyung, Yook Dong Shik
Location: Daehan Securities
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Final Confrontation — Final showdown between Dong-sik and Seo In-woo Characters: Seo In Woo, Yook Dong Shik, Shim Bo Kyung
Location: Unknown location
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Resolution — Dong-sik returns to normal life Characters: Yook Dong Shik, Shim Bo Kyung, Yook Jong Chul, Yook Ji Yeon
Location: Home
The story of a man named Yook Dong-sik who coincidentally witnesses a murder and picks up the killer's diary. While fleeing the scene, he gets into a car accident causes him to lose his memory. Due to the diary in his possession, he mistakenly believes that he is a psychopathic serial killer.
