In 1020 AD, as a devastating tempest ravages the kingdom of Frank, Lord Terence executes his darkest ambition within the castle's depths. A teenage boy, bound and helpless, becomes the unwilling sacrifice for Terence's pursuit of immortality. When the lord's blood ritual succeeds—wounds vanishing, scars erasing, his body regenerating with inhuman speed—he achieves what he's craved for decades: eternal life. But immortality is merely the beginning of his cruelty. The boy's memories are stripped away by a sinister elixir, leaving him a blank slate, a weapon to be forged. Haldar, Terence's elite ninja warrior, claims the hollow youth and vanishes into the shadows to transform him into the kingdom's most lethal assassin—a feared instrument of death bound to serve one master forever. What neither Terence nor Haldar anticipated is the boy's awakening. As fragmented memories resurface and his true identity emerges, the immortal assassin becomes consumed by a burning need for vengeance. Caught between the man who enslaved him and unexpected passion that challenges everything he's been forced to become, he must navigate a treacherous web of secrets, betrayal, and forbidden love. In a world where trust is a luxury and survival demands ruthlessness, one question haunts him: can a weapon of death ever reclaim his humanity—or will revenge consume the only thing that makes him feel alive?