← Back to South Korea casesChoi Ji-eun Allegedly Murdered by Park Young-woo and Kim Soo-min, Seoul, South Korea
Case Summary
On January 22, 2015, Choi Ji-eun was found collapsed at home and later pronounced dead at the hospital. Her husband, Park Young-woo, brought her to the hospital but delayed calling emergency services and was intoxicated. Park had an extramarital affair with Kim Soo-min, who was the last person to see Choi alive. Autopsy revealed cyanide poisoning as the cause of death, with cyanide detected in the soju bottle Choi drank. Investigations showed Kim Soo-min attempted to purchase cyanide multiple times and searched for cyanide murder methods on her work computer. Lie detector and behavioral analyses indicated Kim's involvement. Kim was sentenced to life imprisonment for murder. The case involved complex relationship dynamics including infidelity and jealousy.
Basic Information
Country: South Korea
State/Province: None
City/Region: Seoul
Incident Type: Murder
Relationship Status: Married
Relationship Duration:
Affair / New-Partner Context
Recorded context: Affair started / overlapping relationship
Reported initiator: Alleged suspect / offender
Relationship timing: During marriage or ongoing partnership, before separation
Incident Date: Jan. 22, 2015
Incident Sequence and Additional Victims
Primary reported outcome: Homicide
Reported self-harm outcome: No suicide or attempt reported
Reported sequence: Order not reported / unclear
Additional victims reported: 0
Relationship Journey
Relationship Origins:
- Arranged marriage
Relationship Stages:
- Married Living Together
Analysis
Contributing Factors:
- Cheating / Infidelity
- Domestic Conflict
Red Flags:
- False accusations of infidelity
- Escalation Pattern / Violence
- Secret affair
- Manipulative behavior
- Threats
- Divorce Pending / Recent Separation
Motives:
- Revenge
- Jealousy
- Eliminate romantic rival
Relationship Outcomes:
- Legal case ongoing
- Homicide before marriage
- Arrest made
People Link Graph
Relationship Journey Graph
Origin
- Arranged marriage
How the relationship or connection began.
Status
- Married
Stages
- Married Living Together
Important relationship phases recorded for this case.
Warning Signals
- False accusations of infidelity
- Escalation Pattern / Violence
- Secret affair
- Manipulative behavior
- Threats
- Divorce Pending / Recent Separation
Reported red flags or early concern points.
Pressure Points
- Cheating / Infidelity
- Domestic Conflict
- Revenge
- Jealousy
- Eliminate romantic rival
Contributing factors and possible motives from the available sources.
Incident
2015-01-22
Outcome
- Legal case ongoing
- Homicide before marriage
- Arrest made
Recorded relationship or case outcome.
Sources
English labels are shown first. Original-language titles are preserved for source verification.
Choi Ji-eun Allegedly Murdered by Park Young-woo and Kim Soo-min, Seoul, South Korea
사건의뢰 · Original language: Korean
View original title
[스모킹건2]닦아도 닦아도 그대로인 붉은 입술. 식탁에 남아있는 아몬드. 갑자기 사망한 아내의 죽음과 아몬드는 어떤 관련이 있을까? 내연녀 아내 살인사건의 진실은?
AI Intelligence Assessment
Relationship Pattern
Infidelity
Pattern Analysis
The case centers on a married couple with a troubled relationship marked by the husband's extramarital affair. Jealousy and domestic conflict escalated, culminating in the murder of the wife by poisoning with cyanide administered by the husband's mistress. The pattern reflects infidelity-driven violence with manipulation and deception by the mistress.
Investigative Notes
Police investigation included autopsy, chemical analysis of the soju bottle, lie detector tests, and behavioral analysis. Kim Soo-min was identified as the perpetrator through evidence of cyanide purchase attempts, internet searches, and physiological responses during interrogation. She was convicted and sentenced to life imprisonment. The husband's role remains suspicious but less directly implicated.
Investigation Confusion
Initial confusion due to husband's intoxication and lack of witnesses. Both husband and mistress claimed victim ingested cyanide herself, complicating early investigation. No direct evidence initially linked cyanide to the drink until forensic tests and lie detector results.
Case Reconstruction / Puzzle Pieces
The victim was found collapsed at home and brought to hospital by her husband, who delayed calling emergency services. Autopsy revealed cyanide poisoning. The mistress, Kim Soo-min, had motive and opportunity, evidenced by attempts to acquire cyanide and internet searches on cyanide murder. Lie detector and behavioral analyses confirmed her deception. Cyanide was likely administered in the husband's car. Kim was convicted of murder; the husband had an affair with her and was emotionally distant.
Risk Assessment
High risk due to ongoing affair, domestic conflict, and access to poison. The husband's intoxication and delayed emergency response increased victim vulnerability.
Key Takeaways
Infidelity and jealousy can escalate to lethal violence. Delayed emergency response and intoxication can worsen victim outcomes. Behavioral and physiological analyses can be critical in uncovering deception. Poisoning cases require thorough forensic and investigative work to establish cause and perpetrator.
AI Case Q&A
What early signals mattered most?
The husband's affair and expressed desire to separate, mistress's attempts to purchase cyanide, and suspicious behavior during interrogation were key early signals.
Which clues helped connect the case?
Autopsy findings of cyanide poisoning, chemical analysis of soju bottle, internet search history on cyanide murder by mistress, and lie detector test results were crucial clues.
Which evidence types appeared strongest?
Forensic toxicology, chemical analysis of drink, lie detector physiological responses, and behavioral analysis of suspect's demeanor provided strongest evidence.
Witness / Eyewitness Statements
No other witnesses besides the husband who brought the victim to hospital. Family suspected the husband due to known affair. Mistress cut off contact after hospital visit.
How did follow-up reports change the understanding?
Follow-up investigations with lie detector and behavioral analysis clarified mistress's involvement and disproved initial claims of suicide or accidental ingestion.
What remained unclear?
Exact role of husband in administering poison remains unclear. No direct evidence conclusively proving who put cyanide in the drink, though mistress was convicted.