The two-thousand-year cycle of Yin years is approaching, when Yin energy rises and Yang energy declines. When the Yin energy rises and the Yang energy declines, many demons and ghosts take the opportunity to cause trouble and harm living beings. Maoshan Taoist Li Wenshan obeys his master's orders to kill demons and save the world. After many hardships, he finally completes the great cause of exterminating demons and becomes a great master.