Hu Bayi (played by Ethan Ruan) is about to go abroad, and he found an old photo while sorting out old things. At that time, he and Fatty (played by Liu Chao) were working as educated youth in the mountainous areas of Greater Khingan Range. Life in the mountains made the young and energetic them feel at home. In order to exchange a few kilograms of fruit candy, they went up the mountain to hunt yellow weasels (yellow weasels), and in order to treat people's illnesses, they caught bears to get gallbladders. Unexpectedly, the two of them mistakenly entered a collapsed yellow skin shrine. Legend has it that decades ago, a group of Hu bandits known as the "Ni'er Club" dug out a gold-painted and jade-inlaid box from the Huangpizi shrine, and then the group of Hu bandits and the box disappeared together in the Mobei grassland. At this time, it happened that their comrade-in-arms Ding Sitian (played by Hao Hao) wrote a letter to invite them to visit the grassland. The two happily went there, but they didn't know that they were just in time to catch the frightened cattle. In order to find the lost cattle, the three and the herdsman Lao Yangpi entered the Baiyan Cave, commonly known as the Hall of the King of Hell. Here, there are some remains of the Japanese "water supply unit", a strange building without rooms, and a basement numbered "0". What's more terrifying is that two yellow foxes with white fur have been following them...