I left a memento for you... What if the memento I left behind... is a person? In the pouring rain at the cemetery, Luna, the mob boss's adopted daughter in black patent-leather boots, received a final message from the man who died saving her: "I left a memento for you." She had been wondering what he could have possibly left behind. But when she looked up, she was met face-to-face with her saviour's younger brother—a dangerous, hot-blooded young anti-narcotics officer who despised her to his core. When lethal poison is forced to chain with unyielding steel, and the "memento" turns out to be a living, breathing hound of vengeance, who is the real prey trapped in this high-stakes game on the edge of light and shadow?