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Case Summary
In February 1980, Choi Si, a 39-year-old factory manager in Busan, was found stabbed over ten times and killed near his home. Investigation revealed his wife, Choi Jeom-soon, had a history of affairs and marital conflict. She secretly took out life and accident insurance policies on her husband worth 50 million won without his knowledge. Choi Jeom-soon conspired with her lover Seo Kyung-mo and his friend Park Yang-su to murder her husband, staging the crime as a robbery. The murder was premeditated, with the first attempt failing on February 3, 1980, and the successful killing occurring on February 14, 1980, the husband's payday. The wife lured her husband to a mountain path after getting him drunk, where the two men stabbed him. Choi Jeom-soon herself stabbed him multiple times to confirm the kill and rolled his body down a slope. All three were arrested on February 19, 1980. Choi Jeom-soon was sentenced to death, while the accomplices received reduced sentences. The case highlights a complex pattern of infidelity, financial motive, and domestic conflict.
Basic Information
Country: South Korea
State/Province: None
City/Region: Busan
Incident Type: Murder
Relationship Status: Married
Relationship Duration: Approximately 15 years (marriage)
Affair / New-Partner Context
Recorded context: New relationship started
Reported initiator: Victim
Relationship timing: During marriage or ongoing partnership, before separation
Incident Date: Feb. 14, 1980
Relationship Journey
Relationship Origins:
- Met at Workplace
- Arranged marriage
Relationship Stages:
- Married Living Together
Analysis
Contributing Factors:
- Cheating / Infidelity
- Financial Issues
- Divorce / Separation
- Family pressure
- Suspicion of infidelity
Red Flags:
- Escalation Pattern / Violence
- Secret affair
- Threats
- Divorce Pending / Recent Separation
Motives:
- Money / Financial Gain
- Revenge
- Eliminate spouse
Relationship Outcomes:
- Homicide during marriage
- Arrest made
- Weapon recovery
- Investigation still ongoing
People Link Graph
Relationship Journey Graph
Origin
- Met at Workplace
- Arranged marriage
How the relationship or connection began.
Status
- Married
Approximately 15 years (marriage)
Stages
- Married Living Together
Important relationship phases recorded for this case.
Warning Signals
- Escalation Pattern / Violence
- Secret affair
- Threats
- Divorce Pending / Recent Separation
Reported red flags or early concern points.
Pressure Points
- Cheating / Infidelity
- Financial Issues
- Divorce / Separation
- Family pressure
- Suspicion of infidelity
- Money / Financial Gain
- Revenge
- Eliminate spouse
Contributing factors and possible motives from the available sources.
Incident
1980-02-14
Outcome
- Homicide during marriage
- Arrest made
- Weapon recovery
- Investigation still ongoing
Recorded relationship or case outcome.
Sources
English labels are shown first. Original-language titles are preserved for source verification.
Choi Si Allegedly Murdered by Choi Jeom-soon, Seo Kyung-mo, and others, Busan, South Korea
사건의뢰 · Original language: Korean
View original title
치밀했던 살인계획, 그녀가 악녀일 수 밖에 없는 이유? - 부산남편청부살인사건
AI Intelligence Assessment
Relationship Pattern
Infidelity
Pattern Analysis
The case involves a long-term marriage deteriorated by the wife's infidelity and financial motives. The wife orchestrated a premeditated murder involving her lover and his friend to obtain insurance money, reflecting a pattern of betrayal, domestic conflict, and financial exploitation.
Investigative Notes
Police conducted a thorough investigation including fingerprinting, alibi checks, and interviews with coworkers and neighbors. The wife was cautiously investigated due to her status as a grieving widow. Evidence included insurance policies, the victim's paycheck, and a dropped wristwatch at the crime scene. The wife confessed after police pressured her by claiming they had located her lover. All three suspects were arrested on February 19, 1980. The wife was sentenced to death; accomplices received reduced sentences.
Investigation Confusion
Initial uncertainty about whether the murder was motivated by robbery or resentment. Police also debated whether the wife could have committed the stabbing alone or used accomplices. The lover's disappearance after the crime added complexity. No confusion reported about suspect identification after confession.
Case Reconstruction / Puzzle Pieces
The victim was stabbed multiple times and rolled down a slope near his home on February 14, 1980. The wife, Choi Jeom-soon, had taken out insurance policies secretly and conspired with her lover Seo Kyung-mo and his friend Park Yang-su to kill her husband. The first murder attempt on February 3 failed. On February 14, the wife lured her husband out after work, got him drunk, and led him to a mountain path where the accomplices stabbed him. The wife herself stabbed him to confirm the kill and rolled his body down the slope. The accomplices fled but were arrested days later. The wife was arrested and confessed under police pressure.
Risk Assessment
High risk due to premeditation, involvement of multiple perpetrators, financial motive, and ongoing extramarital relationships.
Key Takeaways
Premeditated domestic homicide can involve complex financial motives and extramarital affairs. Careful police interrogation and evidence gathering, including insurance checks and witness interviews, are crucial. The case shows the importance of investigating family dynamics and third-party involvement in relationship-driven crimes.
AI Case Q&A
What early signals mattered most?
Marital conflict, wife's infidelity, secret insurance policies, and deteriorating relationship were key early signals.
Which clues helped connect the case?
Dropped wristwatch at the crime scene, insurance policy timing, wife's affair and financial transactions, and witness testimonies helped connect the case.
Which evidence types appeared strongest?
Physical evidence (knives, paycheck, insurance documents), witness statements, and police interrogation leading to confession were strongest.
Witness / Eyewitness Statements
Coworkers reported victim's normal behavior before death. Neighbors and acquaintances described wife's bad reputation and affairs. Children testified about parents sleeping separately. Some neighbors expressed suspicion about the wife.
How did follow-up reports change the understanding?
No follow-up reports beyond initial arrest and trial outcomes were available.
What remained unclear?
Whether the wife was ultimately executed remains unconfirmed.