south Korean former police officer, criminology researcher, and YouTuber. he joined the police force in 1982 and worked as a homicide detective for 32 years, investigating high-profile cases such as the Hwaseong serial murders. after retiring, he became a research fellow at the Korea Institute of Criminology, where he analyzes real-life cases and works to prevent crime through his YouTube channel "Gimbokjun's Case Request".

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