An orphaned, freezing street kid survives by sheer physics and brutal instinct until a ruthless female mentor takes him in, transforming him into an elite, hyper-efficient hitman named Raiko. Years later, Raiko's lethal underworld life collides with a dangerous romance with a conflicted detective named Evelyn, dragging them through bloody betrayals, rogue assassins, and high-stakes conspiracies until they finally carve out a hard-won peace.