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.

A 38-year-old single man, Hong Man-Taek is a petty farmer still living with his mother. Seeing a neighbor married to an Uzbekistan bride and frightened by the fact that his own grandson will never get married, Man-Taek's grandfather decides to send Man-tek to Uzbekistan to find a bride.

A restaurant delivery boy witnesses the murder of his crush during an internet chat session. He becomes the prime suspect and must catch the real murderer before the police catch him.

Navigating both the criminal underworld and law enforcement agencies, professional snitches called "yadang" provide covert information about the drug world to prosecutors and police. When a drug bust at a party attended by high-profile second-generation VIPs entangles those involved into a dangerous conspiracy, a seasoned yadang must do everything in his power not just to make it out on top, but alive.

Do-chul is a boxer who never wins a game. While trying to make some money, he gets involved with Hong-ki, a small-time crook. They somehow make friends and hang around together, but their views toward life and the world are almost opposite.

A 38-year-old single man, Hong Man-Taek is a petty farmer still living with his mother. Seeing a neighbor married to an Uzbekistan bride and frightened by the fact that his own grandson will never get married, Man-Taek's grandfather decides to send Man-tek to Uzbekistan to find a bride.

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.

Navigating both the criminal underworld and law enforcement agencies, professional snitches called "yadang" provide covert information about the drug world to prosecutors and police. When a drug bust at a party attended by high-profile second-generation VIPs entangles those involved into a dangerous conspiracy, a seasoned yadang must do everything in his power not just to make it out on top, but alive.