Twenty years ago, Shen Yuan, the son of the Demon Lord, and Murong Xue, the daughter of the Immortal Lord, fell in love despite the taboos of both immortals and demons, and gave birth to twins. Immortals and demons join forces to attack, Shen Yuan explodes the golden elixir, and Murong Xue jumps off Wugui Cliff with her child in her arms.
The twins were taken away separately - the elder brother was brought back to the immortal way by Shen Cangtian, the leader of Tianxuan Sect, and was named Shen Qingxuan; the younger brother was brought back to the devil way by Li Tianxiao, the leader of Netherworld Sect, and was named Li Youming.
Twenty years later, there are two brothers. One is the first genius of the immortal way, dressed in white like snow, with the belief of "killing all the demons in the world"; the other is the number one genius of the demonic way, dressed in black like ink, and vows to "kill all the people of the immortal way". They didn't know that they were brothers. They fought with each other with their lives time and time again in the battle between immortals and demons. Every time their swords faced each other, they killed each other.
