In the 90s, a strange and weird case appeared on Yanbo Island in the south, and the residents of the island disappeared mysteriously. At the same time, a short-haired girl suddenly came to the town and seemed to be closely related to the disappearance. In order to find the missing friend You Shangjie, the town high school students Fu Junhao and Zhang Yuxuan took the mysterious girl and searched for the truth. At the same time, Sarah, a female high school teacher who lost her biological brother, also formed a team with Su Minxu, a rich second generation on the island of happy friends. For the sudden appearance on the island, the mysterious black gang launched an investigation ... What is the black mucus appearing everywhere? What was missing from the missing high school student, Shang Shangjie? Why is there a strange sound in the dry well on Haichao Street? Who does the researchers in those black people point to? Everything shows that a huge crisis is quietly approaching the inhabitants of the island, and the good people know nothing about it......