On a distant coast, a town permanently shrouded in mist is steeped in mystery and oppression. The fishermen observe ancient taboos, never daring to cross the line. Curious Wang Yan and brave, clever Jiang Xiying join forces to investigate after one town resident after another dies in bizarre positions that defy the human body’s anatomy.
A mysterious force from the deep sea is secretly at work, hindering their search for the truth. If they fail, every resident of the town will die. During the investigation, Wang Yan unexpectedly discovers that an old friend is conspiring with the villains, forcing him into the agonizing choice between saving his beloved Jiang Xiying and exposing the truth.
Both are afraid of the unknown horrors, and that fear seriously hampers their investigation. Meanwhile, the townspeople mistake them for accomplices to the killer, plunging them into a crisis of trust. As their investigation deepens, the deaths accelerate, and they have less and less time. The hostile, mist-shrouded surroundings also keep their lives in constant danger.
As Wang Yan and Jiang Xiying transmigrate again and again, they grow from panicked and helpless into calm strategists. They search for clues in ancient legends and abandoned buildings, matching wits with a brilliant villain across time and space. Caught between the “butterfly effect” of changing the past and difficult moral dilemmas, they press on in the hope of uncovering the truth and saving the town.