Six years ago, a ride-share murder took place on a rainy night in Tianyun City. Fang Yuansong was killed, and his son, Fang Lü, watched his mother suffer a mental breakdown. Mocked and discriminated against himself, Fang Lü grew consumed by hatred. Six years later, a similar case occurred: Feng Xinsheng was murdered, and his wife, Sister Wang, put pressure on the police. Liu Yuan, a rookie officer, was drawn into the investigation. The police found similarities between the two cases, but also differences. The new investigation ran into one obstacle after another. There were no clues at the scene, and the ride-share records pointed to Zhu Xiaomei, a missing female student. Wang Mengyu, the captain of the women’s criminal investigation squad, took over the case and proposed that the killer had used specialized audio recording and signal-blocking equipment. Liu Yuan helped repair anti-jamming equipment and discovered that Feng Xinsheng had clashed with someone before the murder. The victim Su Xiaoyuan was also connected to the incident. The investigation linked Su Xiaoyuan to Zhu Xiaomei, who had frequently visited an upscale restaurant. The restaurant’s owner, Feng Tao, was a Chinese American. The surveillance system had been sabotaged, and Zhu Xiaomei’s spending records were suspicious, suggesting she had been involved in illegal dealings. The police uncovered a criminal network exploiting several female students, with Feng Xinsheng and Wang Bo among its key figures. The killer, Fang Lü, had planned a series of murders to discover the truth about his father’s death, using specific conditions and equipment to conceal his tracks. Through technical analysis and detective work, the police found crucial evidence and convicted Fang Lü. He confessed, but felt no remorse for some of his actions. Shi Rui, a member of a foreign spy organization, infiltrated the arrest scene and seriously wounded Wang Mengyu. Shi Wuyue, a police officer, discovered that her daughter was acting strangely and tried to put duty before family, but failed. In the end, Fang Lü was convicted, the criminal network was dismantled, the female students were rescued, and public order was restored. After enduring many trials, Wang Mengyu gained a deeper understanding of her career and life, while Liu Yuan grew as well.