Seven years ago, trainee police officer Du Yaoran witnessed his girlfriend Jiang Qingxi's tragic death with her throat cut, and the murderer was at large. Seven years later, when he became the captain of the criminal investigation, while investigating a serial murder case, he discovered that the manner of death of all the deceased corresponded to the undisclosed details of the unsolved case. When the pendulum of fate began to reverberate, he faced not only the cold-blooded imitators, but also the bloody truth that had been deliberately tampered with.
