Kim Woo-Hyun (So Ji-Sub) is the only son of a high ranking police officer. Woo-Hyun entered the police academy ranked first and graduated from the academy ranked first. As a detective, he then joins the cyber investigation department. Woo-Hyun then works to reveal the secrets of those that hide within the cyber world. Kim Woo-Hyun leads the cyber investigation team and works to take down an illegal international gambling website. South Korea, Hong Kong and China all cooperate to arrest those involved with the website at the same time. When Kim Woo-Hyun and his team raid the location of the site, the data is destroyed by a program set up by Hades. Nevertheless, Kim Woo-Hyun and his team uses a traceroute to locate Hades.