Hong Seung-tae and Han Young-yi Allegedly Murdered by Yang Jeong-su, Gumi, Gyeongbuk, South Korea
This source-based behavioral analysis does not establish a clinical diagnosis, motive, or legal finding.
This case involves a violent, unplanned attack on an engaged couple by a stranger with a criminal history, resulting in homicide and severe trauma. The psychological analysis focuses on the perpetrator's impulsivity, the victim's trauma, and the relationship dynamics of the engaged couple.
The couple was engaged and preparing for marriage, living together with family approval. The attack was by an unrelated stranger, not involving prior relationship conflict but resulting in devastating impact on the couple's future and the victim's psychological health.
The perpetrator followed the victim, initiated an unplanned violent attack with a weapon, escalated to attempted rape, and fatally stabbed the fiancé during intervention, then fled, indicating impulsive aggression and violent escalation.
Each entry separates the reported behavior or state from the analytical strength of the available narration.
| Behavior / construct | Person / subject | Detailed case context | Evidence |
|---|---|---|---|
| Impulsive aggression Planning or impulsivity | Yang Jeong-su Suspect |
The perpetrator carried a knife and followed the victim without clear planning, reacted violently when confronted, stabbing the fiancé deeply and fleeing in panic, indicating impulsive aggression. Context or trigger: Following victim and initiating attack with knife Reported expression: Unplanned stabbing and violent behavior during struggle |
Narrative-supported psychological state Confidence: High |
| Grief and bereavement Emotional state | Han Young-yi VictimWife of the victim |
The victim experienced severe psychological trauma after witnessing her fiancé's fatal stabbing, resulting in long-term mental health issues including PTSD and speech impairment. Context or trigger: Witnessing fiancé's stabbing and death Reported expression: Development of post-traumatic stress disorder and aphasia |
Explicitly reported Confidence: High |
| Fear or perceived threat Emotional state | Han Young-yi VictimWife of the victim |
Faced with a sudden knife threat, the victim resisted fiercely, grabbing the knife and fighting to survive despite injury, demonstrating acute fear and survival instinct. Context or trigger: Being threatened with a knife and attacked Reported expression: Resistance and fight for life |
Explicitly reported Confidence: High |
| Coercive control Control dynamics | Yang Jeong-su Suspect |
The perpetrator stripped the victim and took photos, likely to intimidate or threaten her with exposure, indicating a pattern of coercive control during the assault. Context or trigger: Stripping victim and taking photos during attack Reported expression: Attempt to intimidate and threaten victim |
Narrative-supported psychological state Confidence: Moderate |
| Maladaptive coping Coping response | Yang Jeong-su Suspect |
After drinking, the suspect sought to be around people but impulsively followed and attacked the victim without rational planning, reflecting maladaptive coping with loneliness or stress. Context or trigger: Following victim after drinking and seeking people Reported expression: Random violent attack without clear motive |
Narrative-supported psychological state Confidence: Moderate |
| Social isolation Relationship stressor | Yang Jeong-su Suspect |
The suspect lived alone, was estranged from his mother, and had a history of criminal behavior, indicating social isolation that may have contributed to his behavior. Context or trigger: Living alone, estranged from mother Reported expression: Loneliness and lack of social support |
Explicitly reported Confidence: High |
| Prior interpersonal violence Prior violence | Yang Jeong-su Suspect |
The suspect's extensive criminal record for theft suggests a pattern of antisocial behavior that escalated to violent crime in this case. Context or trigger: History of 20 prior theft convictions Reported expression: Criminal behavior and possible escalation to violent crime |
Explicitly reported Confidence: High |
| Emotional escalation Escalation | Yang Jeong-su Suspect |
During the struggle, the suspect escalated from attempted rape to stabbing the fiancé fatally, showing rapid emotional escalation under stress. Context or trigger: Struggle with victim and fiancé Reported expression: Violent stabbing during confrontation |
Narrative-supported psychological state Confidence: High |
| Help-seeking or disclosure Coping response | Han Young-yi VictimWife of the victim |
Despite trauma and injury, the victim managed to escape and promptly call emergency services, facilitating police response. Context or trigger: Escaping and calling emergency services Reported expression: Reporting the crime immediately |
Explicitly reported Confidence: High |
Select a stage to expand it; scroll horizontally to follow the full sequence.
The couple met at work, received parental approval, lived together in a one-room apartment, and planned marriage and opening a restaurant.
The suspect lived alone, was estranged from family, and had a long history of theft convictions, indicating social marginalization.
After drinking, the suspect followed the victim without clear plan, initiated attack with a knife, and escalated violence during struggle.
The suspect stripped the victim, took photos to intimidate or threaten, and attempted rape before the fiancé intervened.
When confronted by the fiancé, the suspect stabbed him deeply, causing fatal injuries, then fled the scene.
The victim escaped, called emergency services immediately, enabling rapid police response.
Police collected forensic evidence, conducted area searches, reviewed CCTV and taxi GPS data, leading to suspect identification.
Suspect was arrested at a motel, found with injuries consistent with the crime, and confessed under interrogation.
The victim developed PTSD and aphasia, suffering long-term psychological effects from the incident.
Arrows show the sequence described in the source narrative; they do not prove that one psychological state caused the next event.
The source is a police and media report with limited clinical psychological data. The perpetrator's mental state and motives are inferred from behavior and criminal history without formal diagnosis.