Nearby police stations located in the Seoul districts of Mapo and Seodaemun are usually compared to each other and, consequently, has developed a rivalry. The chief at the Mapo police station is Hwang Jae Sung, who is fearless when it comes to catching criminals and uses any means necessary. To top the Mapo station, the Seodaemun police station appoints its new leader Jung Ui Chan, who graduated from the prestigious police academy. An award for "officer of the year" is given out to the officer able to apprehend the most criminals. The award also comes with a 30 million Won cash prize. Hwang Jae Sung wants to receive the award as he wants a promotion and did not graduate from the police university. Jung Ui Chan also badly wants to win the award for the prize money involved - his girlfriend is pregnant. For this award, the two rivals compete even more fiercely. A serial rapist case then occurs, causing both stations to work together. The outcome hangs in the air.