Follows a serial killer who came to light as a psychopath to the Korean public in 2004.

From 2003 to 2004, in a span of less than a year, Yoo Young-chul killed a total of 20 people in various parts of Seoul, targeting victims including wealthy elderly people, masseuses, and young women. The large number of brutal murders he committed, cruel methods of killing he used, and grotesque dismemberment of bodies were horrific and unprecedented.