Jeong Do-man is a low-ranking traffic cop whose tendency to do things "by the book" sometimes gets him in trouble, such as when he pulls over his new boss, newly instated police chief Lee Seung-man, and issues him with a traffic ticket. Though surprised and annoyed by the unexpected fine, the police chief has bigger problems; the town of Sampo has been hit by a string of bank robberies, and to reassure the public he decides to carry out a realistic drill which will demonstrate the police force's capability. Do-man is chosen to act out the part of the bank robber, but with his usual fastidious attention to detail he sets out to commit the perfect crime.