In the dead of night, a seemingly minor car accident turns into a bloody encounter when a mysterious man fatally stabs the other driver. This assailant is a remorseless serial killer, known only as 'K' (Kim Sung-kyu), who uses orchestrated fender-benders to trap his prey. One night, he chooses the wrong victim: Jang Dong-su (Ma Dong-seok), the powerful boss of a local gang. Despite being brutally stabbed, Jang survives and gets a clear look at his attacker's face, making him the only living witness.
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