But as I turned to leave, I saw a small piece of paper on the floor, with a message scrawled on it in red ink: "I said I saw the devil install."

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The story centers on Kyung-chul, a serial killer who murders without mercy. After he kills the daughter of a retired police chief, the victim's fiance (played by Lee Byung-hun) decides to hunt down the murderer himself. The chase turns into a game of cat-and-mouse that blurs the lines between good and evil, with the protagonist using extreme methods to inflict pain on the killer. Why "Install" Sites Can Be Risky