Story Structure — 4 Plot Phases
The Landlord's Grind
Shim Deok-su navigates his daily routine of collecting rent and dealing with neighborhood tensions. He witnesses suspicious deaths and interacts with a tenant who hints at a darker truth.
Key Events
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Landlord's Morning Routine — Grumpy landlord begins his day harassing tenants for rent. Location: Apartment Building
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Rent Collection at Choi's — Deok-su demands overdue rent from ailing tenant Mr Choi. Location: Choi's Apartment
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Charity Intervention — Volunteers plead for empathy while Deok-su remains unmoved. Location: Choi's Apartment
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Discovery of Dead Bodies — Deok-su encounters police clearing two dead bodies on the street. Location: Street
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Choi's Preparations — Mr Choi prepares an extravagant dinner for a former colleague. Location: Choi's Apartment
Shadows of Murder
Mr Choi is brutally murdered, and Ji-Eun is kidnapped by the unseen killer. The neighborhood turns against Deok-su, while a retired detective begins to uncover the truth.
Key Events
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Choi's Preparations — Mr Choi prepares an extravagant dinner for a former colleague. Location: Choi's Apartment
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Murder Theory Revealed — Choi theorizes the deaths are murders targeting the elderly. Location: Choi's Apartment
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Choi's Murder — An unseen assailant murders Choi and stages it as suicide. Location: Choi's Apartment
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Roommate's Discovery — Ji-Eun returns to find her roommate murdered with a slit throat. Characters: Kim Ji-eun
Location: Ji-Eun's Apartment
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Ji-Eun's Kidnapping — The hidden killer attacks Ji-Eun and kidnaps her. Characters: Kim Ji-eun
Location: Ji-Eun's Apartment
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Neighborhood Backlash — Residents blame Deok-su for Choi's death due to prior tension. Location: Apartment Building
Uncovering the Pattern
Detective Pyung-Dal arrives and proves the murders are connected to a 30-year-old case. Deok-su and Pyung-Dal form an alliance, bypassing official channels to track the kidnapper.
Key Events
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Neighborhood Backlash — Residents blame Deok-su for Choi's death due to prior tension. Location: Apartment Building
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Pyung-Dal's Arrival — Retired detective arrives late to investigate the suspicious death. Location: Apartment Building
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Suicide Proof Uncovered — Pyung-Dal finds evidence proving Choi was murdered, not suicidal. Location: Choi's Apartment
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Historical Case Details — Pyung-Dal shares details of a 30-year-old murder pattern. Location: Choi's Apartment
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Profile Match Realization — Deok-su realizes Ji-Eun matches the victim profile and rushes out. Location: Street
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Gang Confrontation — Deok-su encounters thugs, one linked to a murdered victim. Location: Street
The Doctor's Mask
The duo breaches the killer's hideout, discovers gruesome evidence, and finally exposes the perpetrator's true identity. Their covert mission culminates in a race against time to save Ji-Eun.
Key Events
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Gang Confrontation — Deok-su encounters thugs, one linked to a murdered victim. Location: Street
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Apartment Entry — The duo enters the apartment to check on the missing tenant. Location: Ji-Eun's Apartment
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Refrigerator Horror — They discover the severed head of Ji-Eun's roommate. Location: Ji-Eun's Apartment
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Covert Investigation Pact — Pyung-Dal convinces Deok-su to bypass police to save Ji-Eun. Location: Ji-Eun's Apartment
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Tracking the Abductor — The partners team up to hunt down the kidnapper. Location: City Streets
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Perpetrator Reveal — The mild-mannered doctor is exposed as the serial killer. Location: Doctor's Clinic
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Doctor's Double Life — The killer's public image as a devoted husband is contrasted with his crimes. Location: Town Square
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Rescue Mission Launch — The investigation concludes with a focused drive to rescue Ji-Eun. Location: City Streets
After people in his town start turning up dead, a grumpy landlord is visited by a man who recounts an unsolved serial murder case from 30 years ago that may hold the clue to what is happening now.