Tang Yu, the crown prince of the Tang Kingdom, willingly travels to the northern frontier as a hostage for eighteen years in exchange for peace for his country. When his term ends, he returns home with joy, turning down the high position promised by the Demon Empress. Instead, he is greeted by the blades of his own kin and endless betrayal. His younger brother, Tang Tian, covets his Supreme Sword Bone, while his father and mother watch coldly and his two elder sisters believe one side of the story. Stripped of his cultivation and expelled from the royal clan, he falls overnight from a favored prodigy to an outcast despised by all. Yet none of them knows that the Supreme Sword Bone everyone covets is actually an impurity within Tang Yu's body.