Detective Hyung Min is asked to lead a special unit to catch a notorious crime organization ruled by the kingpin, Scale.
Complications rises as Shi Hyun (Doctor's son) takes over Scale's organization.
Trouble ensues when Kim Eun Soo goes undercover.
Ji Hyung Min convinces Yoon Soo Min to go undercover in order to get to Doctor's Son.
Team Leader Ji finds out there is a spy in the police.
Severely injured after being it by a car, Team Leader Ji continues his search for Doctor's Son alone.
Jin Sook finds out that Soo tried to have her killed in prison.
Doctor's Son encounters a mission that tests all his weaknesses.
Doctor's Son puts his guard down and gets romantically involved with someone.
Doctor's Son finds out that a gang member is actually an undercover agent.
Team Leader learns compassion from an unlikely source.
The gang is divided after finding out that Safari is in fact a police officer.
Everyone is trying to find out if a dead guy is Doctor's Son. Yoon Soo Min's affection for "Mr. Gangster" puts her life at risk.
Doctor's Son learns a startling truth about his deceased mother.