Hu Bayi, Wang Fatzi and Da Jinya were deceived by the story of embroidered shoes made up by the villagers and went to Gulan County, Shaanxi. The waterway is difficult and dangerous, and Hu Bayi stepped forward to let everyone get out of danger. Fortunately, he was reminded by Chen Blind in the guest house and was able to escape the trap of the villagers. The three of them unintentionally fell into the "Longling Grotto" and were attacked by bats, found that there were red spots on their bodies, and decided to repair at Uncle Wang's house, met Shirley Yang, who also came to find the root of the red spots, and heard the heroic story of Partridge Whistle and Master Dust looking for the dust beads. Several people are determined to find the dust beads, and Chen Blind tells them that the "inner hidden eye" is here. The villagers repeated their old tricks, threatening Hu Bayi and others to find money, two groups of people went to the cave, were attacked by spiders, and were trapped in the dark pavilion, but everyone worked together to save the day, and finally entered the "chessboard" mechanism, everyone cooperated, found the dragon bone Tianshu, escaped from the cave, and prepared to go to Yunnan to continue to decipher the "red spot".