After witnessing a shocking betrayal between his queen and a corrupt mystic, the emperor of a powerful dynasty is murdered and devoured by a monstrous serpent. His enemies use his death to fuel a national panic, framing the tragedy as a supernatural plague while they plot to exterminate his remaining family. However, the emperor's soul does not vanish. He awakens in the body of a tiny, harmless-looking snake, gifted with a "Terror Evolution System" that allows him to grow stronger by harvesting human fear.
To reclaim his throne and protect his son, he begins his revenge in the most intimate of places. His first target: the queen’s own bedchamber. By terrifying the woman who betrayed him, he triggers a rapid, monstrous evolution. But as he transforms from a garden snake into a world-ending dragon, he discovers a darker secret behind the mystic's power. Can he settle his blood debt before his new reptilian nature consumes his human heart?
