Ms. Choi Murdered by Ms. Oh and Mr. Park, Songpa-gu, South Korea
This source-based behavioral analysis does not establish a clinical diagnosis, motive, or legal finding.
This case involves complex emotional and relational dynamics characterized by infidelity, jealousy, and obsessive behavior culminating in lethal violence. The interactions among the victim, husband, and mistress reveal patterns of deception, manipulation, and escalating conflict.
The marriage between Ms. Choi and Mr. Park was strained by Mr. Park's extramarital affair with Ms. Oh. Ms. Oh's obsessive pursuit of Mr. Park and attempts to disrupt the marriage led to repeated confrontations and financial settlements. The victim attempted to preserve the family despite betrayal, while Ms. Oh exhibited manipulative and controlling behaviors to secure Mr. Park's affection.
The pathway to murder involved discovery of the affair, failed attempts at separation, financial disputes, and obsessive planning by Ms. Oh. The escalation included secret recordings, stalking behaviors, and ultimately premeditated poisoning.
Each entry separates the reported behavior or state from the analytical strength of the available narration.
| Behavior / construct | Person / subject | Detailed case context | Evidence |
|---|---|---|---|
| Jealousy Emotional state | Ms. Oh OffenderLover of offender |
Ms. Oh reacted with intense jealousy when Mr. Park sent breakup texts. She retaliated by sending compromising photos to Ms. Choi and escalating conflict through manipulative messages. Context or trigger: Discovery of Mr. Park's intention to break up with her Reported expression: Anger, sending nude photos to victim, attempts to sabotage relationship |
Explicitly reported Confidence: High |
| Premeditation and planning Planning or impulsivity | Ms. Oh OffenderLover of offender |
Ms. Oh meticulously planned the murder, including multiple attempts to buy cyanide, using gloves to avoid leaving fingerprints, and wiping evidence from the crime scene. Context or trigger: Attempts to purchase cyanide and avoid detection Reported expression: Detailed notes on avoiding CCTV, buying gloves, wiping fingerprints |
Explicitly reported Confidence: High |
| Coercive control Control dynamics | Ms. Oh OffenderLover of offender |
Ms. Oh sent frequent texts to Mr. Park to monitor his activities and used accusations to destabilize the victim's relationship with him. Context or trigger: Manipulative texts and attempts to control Mr. Park's behavior Reported expression: Sending messages to confirm husband's whereabouts, accusing victim of infidelity |
Explicitly reported Confidence: High |
| Family opposition or interference Family dynamics | Ms. Oh OffenderLover of offender |
Ms. Oh's mother was present at the temple during arrest and tried to hide Ms. Oh's phone, indicating possible knowledge or involvement in concealment. Context or trigger: Mother calling Mr. Park about daughter's suffering Reported expression: Attempted to hide phone, possibly aware of crime |
Explicitly reported Confidence: Moderate |
| Emotional escalation Escalation | Ms. Oh OffenderLover of offender |
The re-exposure of the affair triggered intense emotional escalation in Ms. Oh, culminating in the decision to murder Ms. Choi. Context or trigger: Affair discovery on January 11, 2015 Reported expression: Explosive anger and anxiety leading to murder |
Explicitly reported Confidence: High |
| Maladaptive coping Coping response | Ms. Oh OffenderLover of offender |
Despite financial settlements and agreements to separate, Ms. Oh resumed the affair and escalated to lethal violence as a maladaptive coping mechanism. Context or trigger: Repeated attempts to maintain relationship despite separation Reported expression: Resuming affair after financial settlement, planning murder |
Explicitly reported Confidence: High |
| Deception or concealment Behavioral pattern | Ms. Oh OffenderLover of offender |
Ms. Oh used a two-number phone service to hide calls and deleted planning notes which were later recovered by forensic analysis. Context or trigger: Use of two-number phone service and deleting notes Reported expression: Concealing communications and plans |
Explicitly reported Confidence: High |
| Victim devaluation Cognitive pattern | Ms. Oh OffenderLover of offender |
Ms. Oh denied killing Ms. Choi and instead accused Mr. Park, showing a pattern of victim devaluation and moral disengagement. Context or trigger: Blaming victim and denying crime Reported expression: Denial of guilt and blaming Mr. Park |
Narrative-supported psychological state Confidence: High |
Select a stage to expand it; scroll horizontally to follow the full sequence.
Mr. Park and Ms. Oh began an extramarital affair after reconnecting at an elementary school reunion in February 2014.
Ms. Choi discovered the affair in early September 2014, leading to emotional distress and temporary separation.
A financial settlement of 350 million won was paid to Ms. Oh to end the affair, but the couple resumed their relationship shortly after.
Ms. Oh obsessively planned the murder, researching cyanide and methods to avoid detection, including notes on disguises and CCTV avoidance.
Ms. Oh poisoned Ms. Choi by contaminating soju with cyanide during a one-hour meeting, then wiped evidence and left the scene.
After the murder, Ms. Oh transported the victim to the hospital but did not enter, cut off contact with Mr. Park, and later was arrested at a temple performing rituals for the victim.
Arrows show the sequence described in the source narrative; they do not prove that one psychological state caused the next event.
Analysis is limited by reliance on reported facts without clinical diagnoses. Some psychological inferences are based on narrative descriptions and may lack direct evidence.