Rui used to be a singer, but now works at a bar. She then meets successful idol singer Momoko, but, by accident, Rui kills Momoko and her colleagues. To create an alibi, Rui puts together an idol group.
2nd year high school student Kodaka Hasegawa (Koji Seto) has transferred to his new school about a month ago, but he still hasn't made any friends. Kodaka Hasegawa was born from a Japanese father and a British mother.
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 & uses any means necessary.