The local sea fish on Wumu Island have mutated, and villagers who eat fish may mutate into “monster”.

There is a group of cult organizations on the island - Heng Gong. This group of people specializes in the power of evil and leads to the indiscriminate killing of innocent people. Fortunately, Lei Chun and Shen Rang protect the remaining villagers.According to legend, when Heng Gong transforms into a fish body, he is invulnerable to thorns and cannot be boiled to death. At night, he jumps to the shore, takes off his thick shell, and transforms into the form of a Heng Gong ghost.

Xuanming, who was originally believed by the islanders, had been called the sea god of the north since the Tang Dynasty. Because he was replaced by Henggong, he lost his place of belief in the hearts of the islanders.The Wumu Islanders took Chu Sijing and Boyan to see the local village chief Qiu Zhi. Qiu Zhi explained that the islanders did not fish because the villagers had taboos. Once they ate fish, they would be troubled by bad things.