A woman named Ha Yoon-joo joins a police division where the members are largely unarmed and don't wear uniforms. Led by a man named Hwang, the division avoids arresting criminals and focuses exclusively on following them around to gather information. One day a bank is robbed and only one of the seven criminals is caught on camera. In response, Hwang, Ha, and six other officers spend several weeks wandering around the city streets, tagging after people who match the criminal's physical description. When they finally find him, they put cameras outside his apartment.