This work contains AI-assisted content; the story is a fictional dramatization. Chen Du, a young man whose family has been destroyed, has nowhere left to turn, so he ventures to the perilous Cangjian Mountain to seek a master and learn the sword. Living in seclusion on the mountain is Old Six, a cast-out disciple of the Sword Sect, who teaches him a sword technique banned by the sect. This technique is devastatingly powerful, yet it carries a terrifying curse: once mastered to its higher levels, the practitioner will be devoured and possessed by the vengeful remnant soul within the blade, Cang Bugui. As Chen Du painstakingly hones his sword intent and resists the remnant soul's relentless temptations and tests, he also bears the blood feud of his father's murder, struggling bitterly between revenge and protecting his true self.