Haesu Allegedly Murdered by Kang Yeong-gyu, South Korea
This source-based behavioral analysis does not establish a clinical diagnosis, motive, or legal finding.
The case involves a tragic escalation of domestic violence within a short-term engaged relationship, culminating in fatal impulsive aggression. The perpetrator exhibited narcissistic traits and controlling behavior, while the victim endured abuse possibly due to emotional attachment and hope for reconciliation.
Haesu and Kang's relationship progressed rapidly to engagement but was marked by escalating conflicts, jealousy, and controlling behavior. Kang's narcissistic tendencies and inability to tolerate perceived betrayal led to repeated physical assaults. Haesu's optimistic personality and initial endurance of abuse shifted as she began asserting her opinions, triggering further violence.
The pathway began with minor conflicts triggered by jealousy and control, escalating to physical assault and strangulation. The victim's attempt to avoid violence led to a fatal fall. The perpetrator's impulsive aggression and emotional dysregulation were central to the fatal outcome.
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 | Kang Yeong-gyu SuspectHired Suspect/Offender |
Kang reacted with jealousy to a non-romantic invitation, sparking arguments and escalating conflict. This jealousy contributed to his controlling and aggressive behavior. Context or trigger: Text message from victim's female friend inviting her to ski Reported expression: Anger and inability to understand the victim's social interactions |
Explicitly reported Confidence: High |
| Emotional abuse Control dynamics | Kang Yeong-gyu SuspectHired Suspect/Offender |
Kang exhibited repeated degrading and threatening conduct, including physical violence and intimidation, reflecting emotional abuse patterns. Context or trigger: Repeated arguments and controlling behavior during relationship Reported expression: Physical assault, threats, and aggressive outbursts including smashing car windows |
Explicitly reported Confidence: High |
| Impulsive aggression Planning or impulsivity | Kang Yeong-gyu SuspectHired Suspect/Offender |
Kang lost control of his emotions, strangled Haesu, and impulsively pushed her off the overpass, leading to her death. Context or trigger: Argument escalation on day of incident Reported expression: Strangulation and pushing victim off overpass railing |
Explicitly reported Confidence: High |
| Dependency or attachment insecurity Attachment-related behavior | Haesu VictimVictim |
Haesu endured Kang's controlling behavior, interpreting it as love, but began asserting herself shortly before the incident, which may have triggered the fatal escalation. Context or trigger: Endurance of controlling behavior and abuse Reported expression: Tolerated narcissistic tendencies as love, delayed assertion of own opinions |
Narrative-supported psychological state Confidence: Moderate |
| Coercive control Control dynamics | Kang Yeong-gyu SuspectHired Suspect/Offender |
Kang repeatedly called and texted Haesu to hurry, tracked her location, and exerted control over her actions, reflecting coercive control dynamics. Context or trigger: Repeated calls and texts demanding victim hurry Reported expression: Persistent pressure and monitoring of victim's movements |
Explicitly reported Confidence: High |
| Marital dissatisfaction Relationship stressor | Kang Yeong-gyu and Haesu |
The couple's relationship was strained by disagreements and dissatisfaction, particularly as Haesu began asserting independence, leading to conflict and violence. Context or trigger: Conflict over victim's social plans and assertion of opinions Reported expression: Arguments and violent outbursts |
Explicitly reported Confidence: High |
| Emotional escalation Escalation | Kang Yeong-gyu SuspectHired Suspect/Offender |
Kang's emotional state escalated from jealousy and anger to physical violence, including strangulation and pushing the victim off the overpass. Context or trigger: Repeated arguments and perceived betrayal Reported expression: Loss of emotional control culminating in violence |
Explicitly reported Confidence: High |
| Rumination or fixation Cognitive pattern | Kang Yeong-gyu SuspectHired Suspect/Offender |
Kang's narcissistic tendencies led to fixation on his perceived special status and control over Haesu, contributing to conflict and violence. Context or trigger: Narcissistic belief of special status and entitlement Reported expression: Persistent focus on victim and relationship control |
Narrative-supported psychological state Confidence: Moderate |
Select a stage to expand it; scroll horizontally to follow the full sequence.
The couple began dating six months before the incident and quickly became engaged after one month, with family blessings.
Jealousy arose over a text message from a female friend, sparking arguments and tension.
Kang exhibited controlling and aggressive behavior, including pushing Haesu and smashing car windows in anger.
Haesu began asserting her own opinions, departing from previous endurance of abuse, which intensified conflict.
In a loss of emotional control, Kang strangled Haesu and pushed her off the overpass, causing fatal injuries.
Initial investigation treated death as suicide; autopsy re-examination revealed strangulation; suspect arrested after 1 year 8 months; multiple trials led to 7-year sentence.
Arrows show the sequence described in the source narrative; they do not prove that one psychological state caused the next event.
Psychological analysis is limited by reliance on reported behaviors and forensic findings without clinical diagnosis. The suspect's denial and lack of direct testimony constrain understanding of internal motivations.