To pay for his mother’s medical expenses, the hunter A-Ming is forced to risk entering the Spirit Mountain during the "Blood Moon" closed season. Unbeknownst to him, he has fallen into a trap set by tomb raiders Zhang Qiang and his wife. Using the guise of buying game at high prices, they lure him into repeatedly breaking mountain taboos—such as "never kill a pregnant beast"—using him as a "live bait" to find an ancient tomb guarded by a "Shan Xiao" (mountain spirit). After breaking these taboos, strange incidents plague him. Each time he nears death, he is saved by the mountain warden, Lao Jin. Lao Jin painfully reveals that his own son died due to similar taboos and urges A-Ming to put down his gun. With his mother's health improving, A-Ming plans to quit hunting. However, Zhang Qiang and his wife, disguised as siblings, are unwilling to let their plan fail. Zhang’s wife, Xiao Li, uses seduction and exploits A-Ming’s sense of responsibility to force him back into the mountain. Faced with more supernatural horrors and intense pressure, a panicked A-Ming accidentally crashes into the entrance of the ancient tomb. Waiting for him is the cold barrel of Zhang Qiang's gun and a cruel…
