Story Structure — 5 Plot Phases
The Burning Car Mystery
Jo Sang-gil receives an apparent suicide case that quickly reveals signs of a planned killing. His partnership with Cha Eun-young begins under professional tension.
Key Events
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Self-Immolation Case — Jo Sang-gil receives the case of a man who apparently set himself on fire inside a car. Characters: Jo Sang-gil
Location: Mapo District, Seoul
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Rookie Detective Assigned — Jo is required to work with rookie detective Cha Eun-young, recently transferred from motorcycle patrol duty. Characters: Jo Sang-gil, Cha Eun-young
Location: Police department
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Bite Mark Discovered — The dead man has drugs in his system, a large dog bite, and no fingerprints. Characters: Jo Sang-gil
Location: Crime scene
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Timer Reveals Murder — Police discover that a timer in the victim's trouser belt triggered the immolation. Characters: Jo Sang-gil
Location: Crime scene
Bites Behind the Evidence
A second victim confirms that the case involves a trained animal rather than an isolated suicide. The investigation points toward dog-training expertise and a fugitive retired trainer.
Key Events
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Sex Club Lead — Jo traces the victim to a sex club while Eun-young makes a mistake during a fight. Characters: Jo Sang-gil, Cha Eun-young
Location: Sex club
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Promotion Secrecy — Jo withholds progress reports because he wants the credit and hopes the case will earn him a promotion. Characters: Jo Sang-gil
Location: Police department
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Second Victim Found — Nam Sang-hun is found bitten to death by what appears to be a large dog or wolf. Characters: Jo Sang-gil, Cha Eun-young
Location: Crime scene
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Trainer Lead Identified — Dog-trainers identify a retired police-dog trainer as someone connected to the killings. Characters: Jo Sang-gil, Cha Eun-young
Location: Police department
The Hidden Target List
Further attacks push Eun-young to investigate independently. Records and evidence reveal a planned list of six targets and connect the case to Jung-Ah's exploitation.
Key Events
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House Raid Fails — Police raid the retired trainer's house, but he escapes before they can question him. Characters: Jo Sang-gil, Cha Eun-young
Location: Retired trainer's house
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Backstreet Dog Attack — A wolf-dog kills a woman in the backstreets after the failed raid. Characters: Cha Eun-young
Location: Backstreets
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Independent Investigation — Eun-young questions police-dog trainers and investigates missing or dead people connected to the case. Characters: Cha Eun-young
Location: Police records and training facilities
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Suicide Record Reconsidered — Eun-young finds a connection to Kang Myung-ho, who was believed to have committed suicide. Characters: Cha Eun-young
Location: Police records office
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Six Targets Revealed — Evidence shows that the trained dog was prepared to kill six targets, including a police officer. Characters: Cha Eun-young, Jung-Ah
Location: Retired trainer's house
The Minister's Escape
The police freeze the investigation, but Eun-young continues searching for the sixth target. Jo and Eun-young eventually learn that a minister is being hunted.
Key Events
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Jung-Ah Provides Clues — Eun-young learns that Jung-Ah was exploited as a prostitute by five of the victims. Characters: Cha Eun-young, Jung-Ah
Location: Hospital
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Case Frozen — The police department freezes the case, but Eun-young remains troubled by the unidentified sixth target. Characters: Jo Sang-gil, Cha Eun-young
Location: Police department
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Dog Hunt Announced — The police department announces a hunt to kill the attack dog. Characters: Jo Sang-gil, Cha Eun-young
Location: Police department
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Final Target Identified — Jo and Eun-young use the dog hunt announcement to learn that a minister is the final target. Characters: Jo Sang-gil, Cha Eun-young
Location: Police department
The Old House Showdown
The police attempt to lure the attack dog with Jung-Ah's cloth, but the ambush fails. The pursuit ends at an old house, where Jo kills the dog during the final fight.
Key Events
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Eun-young Demoted — Eun-young is demoted to patrol duty by the police chief. Characters: Cha Eun-young
Location: Police department
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Ambush at Old House — Police use Jung-Ah's cloth as bait, but the planned ambush fails. Characters: Jo Sang-gil, Cha Eun-young
Location: Old house
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Final House Pursuit — Eun-young follows the trained dog to an old house where the minister prepares to escape by boat. Characters: Jo Sang-gil, Cha Eun-young
Location: Old house near the escape route
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Attack Dog Killed — During the fight, Jo shoots and kills the attack dog while it bites the minister. Characters: Jo Sang-gil
Location: Old house
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Case Rewarded — Jo is rewarded for solving the case, while Eun-young helps Jung-Ah begin rehabilitation. Characters: Jo Sang-gil, Cha Eun-young, Jung-Ah
Location: Seoul