This South Korean film depicts a disturbing story of a serial rapist and murderer (played by Min-sik Choi, known for Oldboy) who targets the pregnant fiancée of a government agent (Byung-hun Lee, also appearing in A Bittersweet Life and The Good, The Bad, The Weird). What follows is the agent’s relentless pursuit of the killer, involving severe beatings, the placement of a tracking device, financial compensation, and…