On the remote seaside, a small town permanently shrouded in fog is filled with a mysterious and depressing atmosphere. The fishermen abide by the ancient taboos and dare not cross the thunder pond. The curious Wang Yan and the brave and intelligent Jiang Xiying teamed up to investigate after town residents died mysteriously in positions that violated their human anatomy.
The mysterious deep-sea forces are secretly at work, preventing them from exploring the truth. If they fail, all the residents of the town will die. During the investigation, Wang Yan accidentally discovered that his old friend had colluded with the villain. He made a painful choice between saving his lover Jiang Xiying and revealing the truth.
The two are fearful of unknown terrors, which seriously affects the investigation. At the same time, they were misunderstood by the town residents as accomplices of the murderer and faced a crisis of trust. As the investigation deepens, the death rate of small town residents accelerates, leaving less and less time for them. The harsh foggy environment also puts them in constant danger of survival.
Wang Yan and Jiang Xiying gradually grew up from the initial panic to a calm layout during their time travels. They search for clues in ancient legends and abandoned buildings, engage in intellectual games across time and space with highly intelligent villains, and struggle to move forward between the "butterfly effect" and moral dilemmas caused by changing the past, just to uncover the truth and save the town.
