Hu Bayi, Fatty Wang and Da Jin Ya were deceived by the story of embroidered shoes made up by the villagers and went to Gulan County, Shaanxi. The waterway was dangerous, and Hu Bayi stepped forward to help everyone escape. Fortunately, he met Blind Chen at the guesthouse and was reminded to escape the villagers' trap. The three accidentally fell into the "Longling Cave" and were attacked by bats. They found red spots on their bodies and decided to repair them at Uncle Wang's house. They met Shirley Yang who also came to find the source of the red spots, and heard the heroic story of Partridge Whistle and Master Liaochen looking for the Zhuchen Pearl. Several people were determined to find the Zhuchen Pearl, and Blind Chen told them that the "Inner Cangsuo" was here. The villagers used the same trick again and threatened Hu Bayi and others to find money. The two groups went to the cave, were attacked by spiders, and were trapped in the dark room, but everyone worked together to escape danger and finally entered the "chessboard" mechanism. Everyone cooperated to find the Dragon Bone Book, escaped from the cave, and prepared to go to Yunnan to continue to decipher the "red spots".