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Shun (Fukuda Saki), who has tattoos and piercings all over her body, is the third generation descendant of a Japanese orphan left behind in China during World War II. Takeru (Matsushita Yuya) is a lonely and reckless hooligan whose family was murdered when he was a child. Shun, Takeru and Kasumi (Watanabe Natsuna) with an equally troubled past and background, become collaborators after being hired by Kuchinawa (Kamikawa Tamaya) in police undercover operations in the city of 'Midori', a neighbourhood for illegal residents. They infiltrate a criminal gang to investigate, and find illicit human drug experiments and slave treatment staring them in the face. They grow to trust one another and mature through this experience.

A Russian organized crime group is set out to steal an advanced chemical weapon from Korea and two secret agents are out to stop them. One is a veteran secret agent named Ahn Soo-ji (Kim Ha-neul) who is a master of all forms of martial arts and envied by her comrades. Another is a rookie named Lee Jae-joon (Kang Ji-hwan) who’s never been out on the field and always goofs up on the job. The two agents don’t know each other’s secret identity. All that they know is that they hate each other. As a couple that is... Soo-ji and Jae-joon were once a passionate couple until Jae-joon couldn’t take her lies anymore. But all Soo-ji was trying to do was hide her secret identity. Nonetheless, the two went on their separate ways and by coincidence bump into each other years later while out on the job. As the two work out their screwy relationship, they go behind each other’s backs to fulfill their mission to save the world.

An environmental analyst is asked by the police to determine if two deaths by hydrogen sulfide poisoning are an accident - or a murder. But when he meets a young woman at both sites, a scientific mystery begins.