← Back to South Korea casesKang Disappearance Involving Go Yujeong, Jeju Island, Jeju Special Self-Governing Province, South Korea
Case Summary
Kang, a 35-year-old doctoral student and divorced father, disappeared on May 25, 2019, after meeting his six-year-old son and ex-wife, Go Yujeong, at a Jeju Island pension. Go Yujeong reported that Kang had attempted sexual assault, but CCTV showed Kang entering the pension and no footage of him leaving. Investigators found Kang's blood and DNA throughout the pension, and later evidence indicated preparation, dismemberment, and disposal of his body in multiple locations. Go Yujeong denied murder, admitted dismembering and disposing of the body, and maintained that the incident was an impulsive response to sexual assault. She was convicted of murder and sentenced to life imprisonment, although Kang's body was not recovered.
Basic Information
Country: South Korea
State/Province: Jeju Special Self-Governing Province, South Korea
City/Region: Jeju Island
Incident Type: Murder
Relationship Status: Divorced
Relationship Duration:
Incident Date: May 25, 2019
Incident Sequence and Additional Victims
Primary reported outcome: Homicide
Reported self-harm outcome: No suicide or attempt reported
Reported sequence: Order not reported / unclear
Additional victims reported: 0
Relationship Journey
Relationship Origins:
- No data available.
Relationship Stages:
- Separated
- Marriad First Lived Together then Separately
Analysis
Contributing Factors:
- Domestic Violence Allegation
- Domestic Conflict
- Divorce / Separation
- Suspicion of infidelity
Red Flags:
- Secretive communication patterns
- Sudden change in routine or habits
- Discovery of suspicious emails
- Deception after incident
- Suspects identified
- Manipulative behavior
- Missing Victim
Motives:
- Revenge
- Fear of exposure
Relationship Outcomes:
- Legal case ongoing
- Homicide before divorce
- Arrest made
- Investigation still ongoing
- Deadbody recovery
Source Video
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People Link Graph
Kang Disappearance Involving Go Yujeong, Jeju Island, Jeju Special Self-Governing Province, South Korea
Relationship Journey Graph
Origin
How the relationship or connection began.
Status
- Divorced
Stages
- Separated
- Marriad First Lived Together then Separately
Important relationship phases recorded for this case.
Warning Signals
- Secretive communication patterns
- Sudden change in routine or habits
- Discovery of suspicious emails
- Deception after incident
- Suspects identified
- Manipulative behavior
- Missing Victim
Reported red flags or early concern points.
Pressure Points
- Domestic Violence Allegation
- Domestic Conflict
- Divorce / Separation
- Suspicion of infidelity
- Revenge
- Fear of exposure
Contributing factors and possible motives from the available sources.
Incident
2019-05-25
Outcome
- Legal case ongoing
- Homicide before divorce
- Arrest made
- Investigation still ongoing
- Deadbody recovery
Recorded relationship or case outcome.
Sources
English labels are shown first. Original-language titles are preserved for source verification.
Kang Disappearance Involving Go Yujeong, Jeju Island, Jeju Special Self-Governing Province, South Korea
사건의뢰 · Original language: Korean
View original title
고유정 murder of ex-husband case
AI Intelligence Assessment
Relationship Pattern
Domestic Conflict
Pattern Analysis
The reported conflict involved divorced former spouses meeting in connection with their child. Go Yujeong alleged that Kang attempted sexual assault, while investigators and the prosecution presented physical evidence, digital searches, CCTV, and post-incident conduct as supporting a planned homicide. The relationship context included separation, a child-contact arrangement, and Go Yujeong's reported remarriage.
Investigative Notes
Kang's younger brother reported him missing on May 27, 2019, after Kang failed to return or maintain contact following the May 25 meeting. CCTV placed Kang, Go Yujeong, and the child entering a pension, but recorded only Go Yujeong and the child leaving. Forensic examination found small blood traces and DNA attributed to Kang in multiple areas of the pension, while other blood evidence was attributed to Go Yujeong. Police arrested Go Yujeong. The source reports searches involving zolpidem, CCTV, unmanned pensions, bloodstain removal, bone characteristics, and corpse disposal, as well as purchases of detergent, kimchi bags, protective clothing, and shoe covers. The source reports disposal activity at sea, suspected later dismemberment in Gimpo, and seized tools in Cheongju. Go Yujeong was sent to prosecution, convicted of murder, and sentenced to life imprisonment. Kang's body was not recovered.
Investigation Confusion
Go Yujeong claimed that Kang attempted sexual assault and violence, that she acted in an impulsive crime of passion, and that her injuries were defensive wounds. The source reports that forensic commentators considered the shallow, similarly oriented cuts inconsistent with typical defensive wounds, while the prosecution relied on planning evidence and a calm phone call during the alleged crime period. The body was never recovered, and parts were reportedly disposed of in different places, complicating reconstruction.
Case Reconstruction / Puzzle Pieces
Kang traveled to Jeju on May 25, 2019, to meet his son and ex-wife after two years without seeing the child. After a video call at approximately 8 p.m., contact ceased. CCTV and phone-location work led investigators to Kang's car and then to Go Yujeong, the last known person with him. Pension CCTV showed the group entering but not Kang leaving; forensic testing then connected Kang's DNA to blood traces throughout the premises. Investigators linked earlier searches and purchases to possible preparation, while later CCTV, witness accounts, phone-message activity, ferry footage, and recovered tools supported a sequence involving concealment, dismemberment, and disposal. Go Yujeong continued to dispute the motive but was convicted and sentenced to life imprisonment.
Risk Assessment
The source describes a high-risk relationship-connected homicide involving a separated couple, disputed allegations of sexual violence, child-contact conflict, alleged deception, advance searches, procurement of cleaning and disposal materials, and repeated efforts to conceal or relocate evidence. The reported planning indicators and post-incident concealment suggest severe escalation, but this assessment is source-limited and does not independently determine legal responsibility.
Key Takeaways
The strongest relationship-intelligence signals were the combination of separation, a child-contact meeting, disputed abuse allegations, concealment behavior, advance searches, unusual purchases, and efforts to create messages from the victim's phone. The case also illustrates how a missing-person investigation can change rapidly when access evidence, scene biology, digital records, and witness observations converge. The source should be used cautiously because some motive and sequence details are presented as prosecution claims or expert inference.
AI Case Q&A
What early signals mattered most?
The most significant reported early signals were Go Yujeong's advance searches about zolpidem, CCTV, and unmanned pensions; her call to verify pension privacy; purchases of strong detergent and 24 kimchi bags; and the unusual luggage, boxes, and garbage bags observed at the pension.
Which clues helped connect the case?
CCTV showing Kang entering the pension without recorded footage of him leaving, Kang's abandoned car, blood and DNA evidence inside the pension, the child's account, the pension-owner call, manipulated messages from Kang's phone, ferry footage, and later seized tools helped connect the disappearance to Go Yujeong.
Which evidence types appeared strongest?
The source presents CCTV, DNA testing, bloodstain evidence, digital search history, purchase records, phone-message activity, ferry footage, witness observations, and the child's reported account as important evidence types. The body was not recovered, but the source states that the evidence was sufficient for a murder conviction.
Witness / Eyewitness Statements
Kang's younger brother reported him missing and later described Kang's routine and belongings. The pension owner described Go Yujeong carrying luggage, boxes, and garbage bags, and a recorded call reportedly captured her calm manner. The motel owner said she struggled to carry a suitcase. Neighbors in Gimpo reportedly heard banging from an apartment believed to be empty. The six-year-old son reportedly said he ate curry with Kang and that his mother did not eat.
How did follow-up reports change the understanding?
Follow-up investigation changed the case from a missing-person inquiry into a homicide investigation after CCTV showed Kang entering the pension without leaving, forensic testing found his DNA and blood, and digital searches and purchases suggested preparation. Later reports added alleged sea disposal, suspected dismemberment in Gimpo, and seized tools in Cheongju. The trial ended with a life sentence despite the absence of a recovered body.
What remained unclear?
The source does not provide a complete independently verified account of the motive, the precise method of death, the exact sequence of dismemberment and disposal, or the full evidentiary status of the sexual-assault allegation. Kang's body was not recovered, and Go Yujeong continued to describe the incident as an impulsive response to sexual assault.