What happened
Jeong Nam-gyu carried out a series of attacks and murders in Seoul and surrounding areas, often targeting victims he encountered at random.
The investigation
A failed attack led to his capture in 2006. Investigators then compared his movements and methods with unsolved crimes and attributed a broader series to him.
What the courts or investigators concluded
Jeong was convicted and sentenced to death. He died by suicide in prison in 2009.
Why the case remains significant
The case intensified public fear of stranger violence and later became part of broader discussion about how Korean police linked serial crimes before modern integrated databases were fully developed.
Case context
Crime by Region organizes cases geographically so readers can move from one file to other investigations from the same country. For unresolved or contested cases, the wording above reflects the distinction between confirmed events, investigative theories and findings actually established in court.