Jeong Chan-bae

A former serial killer with Alzheimer's fights to protect his daughter from her mysterious boyfriend who may be a serial killer too.

An honest cop has to compromise with his principles when he is told to find a scapegoat for a high-profile serial killer case in exchange for a big promotion.

Three years ago, a father saved his daughter's life. After she's involved in a car accident, it looks like he'll have to do it again, no matter how many attempts it takes.

Sung-Bum is a hot-tempered detective who relies on his intuition to crack cases. He rarely comes across a case that he cannot solve. The body of a police officer is then discovered in a burned out car near an abandoned building. Drugs are also found near the dead officer. To catch the killer the police department sets up a special investigation unit for the case. Sung-Bum takes part in the investigation. Ho-Ryong is a young, confident man who works as a criminal profiler. He trained with the F.B.I. in the United States. Ho-Ryong is also assigned to the special investigation unit. Ho-Ryong relies on evidence rather than instinct. Detective Sung-Bum takes an immediate dislike for Ho-Ryong.

Cho Chun-sam and Noh Dae-gyu, now both in their thirties, are old friends who went to the same elementary school. In their school days, Chun-sam was always the ambitious class president, while Dae-gyu had to settle for a role as vice president. Twenty years later their roles are reversed: Chun-sam is now a humble farmer who has assumed the post of village chief in his hometown, while Dae-gyu is the newly elected county magistrate. At first, Chun-sam asks his old friend for favours regarding the development of his village, but these requests are turned down. Later, when Dae-gyu proposes building a nuclear waste disposal facility in the county, Chun-sam leads demonstrations against the plan, turning old friends into bitter rivals.