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Eun Dae Gu, Uh Soo Sun, Park Tae Il and Ji Gook - otherwise known as the P4 - are the new recruits in the violent crime unit at Gangnam Police Station. These rookies are neither enthusiastic, nor passionate about their new jobs and have joined the crime squad for varying but unbefitting reasons. They are lead by an erratic and hot headed Seo Pan Suk who wants nothing more than to wash his hands of the incompetent new recruits.

The story opens after a young female student kills herself by jumping off a balcony. It's soon discovered that she was in fact stabbed, and the room arranged to make it look like a suicide. And so we begin. A few minor details lead Detective Kanzo (Akashiya Sanma) to suspect that Ryo (Kimura Takuya), an enigmatic chef's assistant, knows more about her death.The two have run into each other by chance a few times, and each time left Kanzo with an uncomfortable feeling. Every clue that is revealed seems to lead to more questions about Ryo, his obsessive girlfriend, his callous and manipulative relations with several women, and about a painful memory from Kanzo's past. Things get more complicated when a powerful love/hate relationship develops between Ryo and Kanza's little sister, the beautiful Yuko (Fukatsu Eri). What exactly is their connection? As the evidence (and body count) rises, Kanza tries desperately to save his sister from Ryo's influence. He's no saint, but is he the Devil Kanza thinks he is? And why? The answers will floor you, even when you think you've got them figured out already.

The film sets in the early of 80s when Bangkok is full with colorful fashions, string musical bands and TV dramas. A drummer boy, Bae (Khridsada Suchosal) is trying to practice his musical skill to the superior scale. At that time, he is suspected to be a murderer and has to flee from a top class agent called Black Ear (Niphon Chaisirikul). Bae tries to prove his innocent to public and also waits for his biggest drum solo versus the most powerful drummer master.