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There is a Hulin Stone Cave in the south, which is a natural stone mine. Because of its remote location, not many people work here. Xiaotian and Lao Liu were from the same hometown. They saw that the mines in Hulin Cave were very expensive, so they came to work here for as much as half a year. Although the work was hard, they could also make more money. One day, Xiaotian went to relieve himself at night, but mysteriously fainted at the entrance of the cave. Everyone thought it was a water leakage or conductive accident, but there was an unknown substance deep inside the cave...