The undercurrent of the Mermaid Empire under the sea is surging. In order to save the life of his family, {Lin Yu} is forced to become a double agent for the Imperial Intelligence Department and the rebel organization. Underneath his gentle appearance, there is a struggle that he cannot speak of. When the Director of the Security Department {Shen Hanzhou} was tracking down the spies, he accidentally triggered the time-traveling power of the ancient coral - every time Lin Yu was exposed or dying, time would go back to three days ago. The first time he looked back, Shen Hanzhou thought it was a hallucination; the second time, he saw the tears in Lin Yu's eyes clearly when he was trembling to deliver information; the third time, he deliberately let Lin Yu leave, but after looking back, he saw the scars of him being tortured by the rebel organization. "What are you afraid of?" Shen Hanzhou grabbed Lin Yu's wrist, his deep sea blue eyes filled with anger and confusion. Lin Yu lowered his eyes, his tail fin trembling slightly in the water: "Director, stop checking, it's good for you and me." In the time loop, the cold director approached step by step, and the gentle spy retreated step by step. When the truth tore through the empire's disguise, they discovered that they had been tied to the same retrospective timeline by fate.
