Psychological & Behavioral Intelligence

Victim Son and Mother Allegedly Murdered by Baek Gwang-seok and Kim Si-nam, Jeju, 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

The case involves a tragic escalation of domestic violence, obsession, and coercive control within a romantic relationship that ended in the murder of a child. The psychological dynamics reveal patterns of jealousy, emotional abuse, and violent outbursts by the suspect, with significant impact on the victim family.

Relationship Dynamics

Baek Gwang-seok exhibited obsessive and controlling behavior toward the mother, including stalking, threats, and physical violence. The relationship deteriorated into separation but continued harassment and violence. The victim son was caught in the conflict, suffering abuse and ultimately fatal violence. The dynamics show coercive control, jealousy, and escalating aggression.

Escalation Summary

The pathway began with dating and cohabitation, followed by increasing obsession and violence, separation, repeated threats and stalking, culminating in a premeditated murder involving an accomplice. Protective interventions were insufficient to prevent escalation.

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	Baek Gwang-seok SuspectHusband of the victim	Baek's jealousy manifested as stalking and repeated threats to kill the mother and son. His obsession led to violent outbursts and controlling behavior, escalating over time. Context or trigger: Relationship deterioration and separation Reported expression: Obsessive following, threats to kill family members, violent assaults	Explicitly reported Confidence: High
Coercive control Control dynamics	Baek Gwang-seok SuspectHusband of the victim	Baek exerted domination through physical assaults, breaking the mother's phone, and throwing away her belongings to prevent her from leaving or contacting others. Context or trigger: During cohabitation and after separation Reported expression: Physical violence, destruction of mother's belongings, restricting her movements	Explicitly reported Confidence: High
Emotional abuse Control dynamics	Baek Gwang-seok SuspectHusband of the victim	Baek repeatedly threatened to kill the mother, son, and himself, creating a climate of fear and emotional distress for the family. Context or trigger: Throughout the relationship Reported expression: Threats to kill loved ones, repeated verbal intimidation	Explicitly reported Confidence: High
Prior interpersonal violence Prior violence	Baek Gwang-seok SuspectHusband of the victim	Baek assaulted the mother multiple times, including punching and kicking, and began hitting the son at some point. He also repeatedly broke into the home. Context or trigger: Before the murder Reported expression: Physical assaults on mother and son, break-ins	Explicitly reported Confidence: High
Fear or perceived threat Emotional state	Mother Victim	The mother and son lived in fear due to Baek's threats and violent behavior, leading to police protection requests and installation of CCTV. Context or trigger: During repeated threats and assaults Reported expression: Anxiety, worry, and requests for police protection	Explicitly reported Confidence: High
Premeditation and planning Planning or impulsivity	Baek Gwang-seok SuspectHusband of the victim	Baek surveilled the home to find entry points, purchased duct tape, and enlisted Kim Si-nam to assist in subduing the victim, indicating deliberate planning. Context or trigger: Days before the murder Reported expression: Surveillance of home, purchasing tape, involving accomplice	Explicitly reported Confidence: High
Instrumental aggression Offender behavior	Baek Gwang-seok SuspectHusband of the victim	Baek used physical violence and binding to subdue and kill the victim son, demonstrating aggression aimed at achieving a lethal outcome. Context or trigger: During the murder Reported expression: Use of violence to achieve killing	Narrative-supported psychological state Confidence: High
Maladaptive coping Coping response	Mother Victim	The mother expressed sorrow and apologized to her son for the suffering caused by the relationship, indicating emotional distress and maladaptive coping. Context or trigger: During abusive relationship Reported expression: Apologizing to son, enduring abuse	Explicitly reported Confidence: Moderate
Grief and bereavement Emotional state	Mother Victim	The mother fainted upon seeing her son's dead body and expressed profound grief and regret over the loss and inability to protect him. Context or trigger: After son's death Reported expression: Fainting, deep sorrow, regret	Explicitly reported Confidence: High

Behavioral Escalation Pathway

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

Narrative sequence

1 Relationship Formation Mother and Baek Gwang-seok Explicitly reported

The mother and Baek were middle school classmates who reconnected when Baek became a customer at the mother's restaurant. They began dating and cohabiting in November 2018.