The ancient god Master Hunyuan was accidentally swallowed by the thousand-year-old colorful spider spirit in the Demon Spider Forest while traveling to seek the truth. His disciple Lu Xiaodao killed the thousand-year-old colorful spider spirit to save his master. Unexpectedly, the colorful spider spirit injected all its venom into Master Hunyuan's body before dying, and Master Hunyuan turned into a colorful spider. In order to cure Master Hunyuan's poison, the master and his disciple were instructed by the fairy Lu Tong to go to Lingxiao Valley in Jiuxian Mountain to find the Crescent Moon Pool. On the way, they had a series of hilarious stories with a group of monsters.