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In Cheonan, a serial murder case takes place, but the case becomes more and more of a mystery. Only Tae-suk, a cop, immediately senses that all the cases are by the same killer and starts investigation. One day, Dong-soo, a gang boss, got attacked by a suspicious man, and Tae-suk realizes that this man is the serial killer, K. Now, Dong-soo becomes the only witness and a survived victim from K. 罪犯头目张东洙（Don Lee）被一名神秘莫测的连环杀手暴力袭击之后幸存，与当地警探郑泰硕（Kim Moo Yul）形成了一种奇妙的搭档关系，联手捕捉被称为“K”的虐待狂杀手”。