The ancient god of war Cang Yan, in the artifact "Sword of Killing Immortals" he wields, is a wisp of the sword spirit Shen Li who has loved him for thousands of years. After the last battle between gods and demons, all his skills were lost. On the way to practice again, he encountered a great opportunity. When he participated in the prophecy of world destruction and pointed out that the spirit of the divine sword was the source of all evil, Cangyan, in order to ensure the stability of the three realms, actually separated Shen Li's soul from the sword with his own hands, and sent him to the netherworld purgatory, leaving his soul to fly away.
Shen Li lost all hope, but his remaining soul merged with the heart of the suppressed Demon Ancestor in purgatory, and he was reborn in blood as the new Demon Lord who controlled the underworld and made the gods tremble. His past memories were shattered, leaving only bone-deep hatred. Hou Cangyan was shocked to realize that the prophecy had been tampered with. Shen Li's sword heart was not the source of the disaster, but the final seal to suppress the real world-destroying demon. His "righteousness" personally unleashed the doomsday. .
Regret gnawed at Cang Yan's soul like tarsal bones. Pursued by both realms of gods and demons, he broke into the demon realm in an attempt to save everything. What greeted him was Shen Li's cold sword edge and taunt: "Thanks to the God of War, I now have the power to confront you." Cang Yan is willing to bear all her revenge. In the end, the world-destroying demon broke out of the seal, and Cang Yan burned his soul to die with him. When he was dying, Shen Li couldn't sit back and watch him die, so she fit into his arms with the demon king's body, activating the power of the same source in his body.
The two souls and flesh merged again, and they forged the divine sword again, sealing the devil forever, and Cang Yan also saved his life. After the war, Shen Li did not forgive him, but only allowed this "waste" who had lost his divine power to kneel outside her demon palace and spend the rest of his endless life making up for the ten thousand years of love that was crushed by his own hands.
