Shi Huan has an enviable marriage - her husband Zhou Mingzhe is gentle and considerate, and her life is stable and perfect. Until that rainy day, she reunited with her crush in college, Silence, and the calm water surface was suddenly broken. Shen Mo handed over a black umbrella, his eyes as deep as when he painted her portrait in the library: "I still keep that painting."
Dust-laden memories began to awaken, and Shi Huan found that his past was full of doubts: missing dates, contradictory diaries, and everyone saying "you are just ordinary classmates." Silence held her hand tightly, and his voice was calm but only revealed a hint of trembling to her: "Shi Huan, our memories have been tampered with."
Under the perfect husband's meticulous "care" and the secret spying of the mysterious organization, Shi Huan sneaks into the fog side by side with the calm and decisive Silence. Every struggle to look back in time makes the unspoken love in youth grow hotter on the edge of life and death. When the fictional life script is torn apart, can they find the stolen truth and hold each other's real hands under heavy surveillance?