In an age of chaos, living beings endure the ravages of war, giving rise to immortals and demons. Hu Yancheng carries the bloodlines of humans, demons, and immortals. In his early years, his parents entrusted his soul to him through a pair of Yin-Yang swords to preserve his spiritual essence. As he grows up, he slays demons to cultivate his powers and rescues Zhang Siwei, a disciple of the Liangyi Sect. The two join forces to eliminate demons. The Demon Lord resurrects through an ancient tree, coveting Hu Yancheng's extraordinary body and laying a trap for him. When Hu Yancheng nearly succumbs to demonic transformation, he is saved by the Great Immortal Dragonfly. He then joins the Qianji Sect to cultivate his powers. After uncovering the Demon Lord's conspiracy, he ventures alone into the enemy's lair for the final battle.