After school, five 18-year-old high school students from Pingling Middle School, Zhao Xing, Leng Junjie, Jin Yachen, Yu Sitong and Zou Weiwei, disappeared collectively. Also disappearing was Leng Chunlai, a parent who was picking up his children that night.

The female criminal police captain Luo Yingwei immediately launched an investigation into five groups of acquaintance families. The four mothers had received extortion text messages suspected of being Leng Chunlai before the kidnapping case: If they want a child, they must pay a ransom of 4 million, and they are not allowed to call the police!The four groups of families quickly collected the ransom money and quietly delivered it to the designated location. However, unexpectedly, all the ransom money was wrapped up in white paper during the delivery.Later, the body of the suspect Leng Chunlai was discovered.

During the investigation, Luo Yingwei discovered that the five mothers Su Jing, Su Yun, Liang Shuhua, Han Xueyan, and Leng Chunlai had hidden their own secrets. The subtle and complex relationships between the characters were revealed, and the children were eventually rescued. The kidnappers were none other than the five mothers.One of them, Han Xueyan.