Psychological & Behavioral Intelligence

Choi Ji-eun Murdered by Kim Soo-min and Park Young-woo, South Korea

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Human-reviewed analysis

Psychological & Behavioral Intelligence

This source-based behavioral analysis does not establish a clinical diagnosis, motive, or legal finding.

Case Overview

This case involves complex emotional and relational dynamics characterized by infidelity, jealousy, manipulation, and escalating conflict culminating in lethal violence. The psychological profile of the mistress reveals manipulative and histrionic traits, while the victim exhibited endurance and sacrifice for family preservation.

Relationship Dynamics

The husband maintained an extramarital affair with a more aggressive mistress who persistently intruded into the marital relationship. The wife, motivated by protecting her daughter and family unity, tolerated infidelity and financial exploitation. The mistress's refusal to end the affair and escalating aggressive behaviors created a toxic triangle marked by deception, emotional abuse, and conflict.

Escalation Summary

The pathway to murder began with the affair's discovery, followed by the wife's attempts to end contact, the mistress's increasing aggression and threats, financial settlements, and ultimately premeditated poisoning. The mistress's psychological manipulation and the husband's divided loyalties contributed to the fatal outcome.

Observed Patterns and Case-Specific Context

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	Kim Soo-min OffenderLover of victim	Kim's jealousy over losing Park led to escalating aggression, including stalking behaviors, threats, and ultimately premeditated murder to eliminate the romantic rival. Context or trigger: After Park attempted to end the affair Reported expression: Aggressive behavior, threats, and eventual decision to kill the wife	Explicitly reported Confidence: High
Marital dissatisfaction Relationship stressor	Choi Ji-eun and Park Young-woo	Despite Park's affair, Choi attempted to maintain the marriage for their daughter, indicating marital dissatisfaction masked by endurance and sacrifice, while Park's behavior reflected lack of commitment and divided emotional investment. Context or trigger: Ongoing extramarital affair and conflict Reported expression: Wife's forgiveness despite infidelity, husband's divided loyalties	Narrative-supported psychological state Confidence: High
Coercive control Control dynamics	Kim Soo-min OffenderLover of victim	Kim exerted coercive control by refusing to end the affair, demanding money, and using emotional manipulation to maintain influence over Park and disrupt the marital relationship. Context or trigger: During affair and after breakup attempts Reported expression: Persistent contact, threats, financial demands, and emotional manipulation	Explicitly reported Confidence: High
Fear or perceived threat Emotional state	Kim Soo-min OffenderLover of victim	Following the murder, Kim exhibited fear and anxiety, seeking spiritual protection and attempting to mitigate perceived supernatural consequences by visiting a shaman's temple and spending significant money. Context or trigger: After murder and during flight Reported expression: Visiting shaman's temple, spending money on prayers	Explicitly reported Confidence: High
Deception or concealment Behavioral pattern	Kim Soo-min OffenderLover of victim	Kim repeatedly lied during polygraph tests about obtaining and using cyanide, attempted to hide her phone, and made false statements about the location and method of poisoning, indicating deliberate deception. Context or trigger: During police interrogation and investigation Reported expression: Lying in polygraph tests, hiding phone, false claims about cyanide purchase	Explicitly reported Confidence: High
Dependency or attachment insecurity Attachment-related behavior	Choi Ji-eun VictimWife of the offender	Choi's attachment to her family and daughter led her to forgive her husband's affair and endure emotional pain and financial strain, reflecting attachment insecurity and dependency on family unity. Context or trigger: Decision to forgive husband and maintain family Reported expression: Endurance of infidelity and financial burden for daughter's sake	Narrative-supported psychological state Confidence: Moderate
Emotional abuse Control dynamics	Kim Soo-min OffenderLover of victim	Kim engaged in emotional abuse by deliberately provoking Choi with evidence of the affair, making verbal threats, and refusing to end contact, contributing to the toxic relationship environment. Context or trigger: During affair and conflict with Choi Reported expression: Sending compromising photos, verbal provocations, and threats	Explicitly reported Confidence: High
Premeditation and planning Planning or impulsivity	Kim Soo-min OffenderLover of victim	Kim carefully planned the murder by purchasing soju, beer, almonds to mask cyanide smell, and conducting internet searches on cyanide poisoning methods over several months, indicating deliberate premeditation. Context or trigger: Before murder on January 21, 2015 Reported expression: Purchasing poison supplies, researching cyanide murder methods	Explicitly reported Confidence: High

Behavioral Escalation Pathway

Select a stage to expand it; scroll horizontally to follow the full sequence.

Narrative sequence

1 Affair Initiation Park Young-woo and Kim Soo-min Narrative-supported psychological state

Park and Kim met at an elementary school reunion in February 2014 and began an extramarital affair about a month later.