The Regional Investigation Team, known as the Korean FBI, is an elite group comprised of the nation's finest detectives, specializing in solving various high-intelligence and high-risk criminal cases. Among them stands out Cho Dae-yeong (played by Kim Myung-min), nicknamed the "monster who solves all cases." Despite his exceptional skills, his fiery temper makes him prefer working alone. Originally investigating a series of murders, he is suddenly ordered by his superiors to halt all current investigations and focus on a business theft case related to the Yakuza. This leaves him sullen and discontented, as he carries painful memories associated with pickpockets from his past...