An old man comes to seek the help of Wu Xie, Wang Pang Zi, and Zhang Qi Ling with a mysterious incident that occurred in the southwestern mountainous area. Fog rises in the mountains and villagers disappear. Everyone pursues the mystery to the abandoned black gold mine in the mountainous area, discovering that all the strangeness comes from mysterious creatures deep in the mine. After experiencing multiple crises, the three not only unravel the old man's conspiracy, but also successfully solve the problem of heavy fog.