Yoo Young-chul terrorized Seoul in the early 2000s, brutally murdering his victims and instilling widespread panic. This gripping docuseries chronicles the intense investigation to apprehend one of Korea's most notorious serial killers. Through interviews and chilling insights, it delves into the psychology behind his crimes and the relentless pursuit by law enforcement to bring him to justice. The narrative captures the societal impact of his actions and the dark undercurrents of a city grappling with fear and uncertainty.