In the twenty-seventh year of the Republic of China, the Lantau fishing village on the coast of the East China Sea was wrapped in thick fog that lingered all year round. The fishermen here have lived by the sea for generations, but they are also firmly bound by the mysteries of the deep sea. Every time there is a full moon and a high tide, some fishing boats are lost in the fog. Those who return are either crazy and gibbering, or have silver scales on their bodies, making them extremely difficult to behave. Shen Qingyi learned from his grandfather the ancient method of identifying fish by watching the tide since he was a child. When he was sixteen, his father's fishing boat was swallowed up by a giant shadow in the sea on a spring tide night, leaving only half a fish bone carved with strange patterns. In order to find the truth, she broke through the ancestral precept in the fishing village that "women are not allowed to enter the forbidden area of the deep sea" and sneaked into the underwater cave strictly guarded by her ancestors, accidentally awakening the secret power sleeping in the fish charm. During the ebb and flow of the tide, she glimpsed the centuries-old contract hidden in the fishing village, and witnessed human nature twisted in survival and greed. The unknown power in the deep sea that controls the tides and dominates life and death is dragging the entire fishing village into the whirlpool of destiny as the mist spreads. She not only has to fight against the magical curse of the deep sea, but also breaks away from the shackles of the world. In the fog and blood, she searches for a way out for the survival of the fishing village and personal salvation.
