Rookie detective Park Sun Woo and Seo Do-Cheol, a veteran of the Violent Crimes Investigation Division team, chase after a serial killer who shakes up their world.Rookie detective Park Sun Woo and Seo Do-Cheol, a veteran of the Violent Crimes Investigation Division team, chase after a serial killer who shakes up their world.Rookie detective Park Sun Woo and Seo Do-Cheol, a veteran of the Violent Crimes Investigation Division team, chase after a serial killer who shakes up their world.