The death toll in Seoul is rising and the victims are all women. The police department is having no luck solving the case, so they have to call in two private detectives: Kim Heechul and Choi Siwon. The M.O of the killer is preying on drunk girls that call a taxi cab to go home, after leaving the club Opera. The killer follows his victims from the K.R.Y bar to Opera and waits until its time to strike. The bodies are always find the alley behind Opera and occasionally in the dumpster on the side of the club. Reporter Lee Donghae writes every article about this serial murder case. At this point ANYONE and EVERYONE is a suspect, and the investigators will not rest until it is solved.