Description：In the police world, open and covert struggles between different police stations are nothing uncommon, and the long-standing rivalry between Mapo Station and Seodaemun Station is also well known. Hwang Jae-sung (Park Joong-hoon) is the chief of police at Mapo Station and a thorough action man. Although he has not received systematic training and education, Hwang Jae-sung has climbed up the career ladder with his daring and daring spirit, and has won the recognition of his colleagues and superiors with his tangible achievements, but his overly rough way of handling cases has also offended many of his peers. Zheng Yican (Lee Sun-kyun) is a fledgling rookie detective. When he first arrived, Zheng Yican was full of energy and ambition for his future career path, hoping to make a big splash in the workplace. The occurrence of a rape case attracted the attention of Hwang Jae-sung and Zheng Yican at the same time. Both of them hoped to solve the case and become famous detectives.