In ancient times, the leader of the demon clan, Bull Demon King, was arrogant and rebellious, causing chaos in the Heavenly Court, but he eventually suffered the consequences and was beaten back to his original form. The Heavenly Lord spared him a way out with compassion, and gave him kindness and demoted him to the mortal incarnation of Liu Jiu. Unexpectedly, several years later, the demonic nature and memory in Liu Jiu's body were deliberately awakened by the traitor. Liu Jiu went to Kunlun alone to seek a solution. On the way, he met Ye Xiaoxiao, the princess of the Flame Mountain. The two shared hardships and gradually fell in love. They also met the little demons Pig Dachang and Dog Shisan on the mountain. Chi You hesitated between good and evil several times and almost caused a disaster, but in the end, good prevailed over evil, and he also solved the conspiracy that had been around him since ancient times.