The young girl Luo Shu's family fell into poverty and she became a slave. Because she understood people's hearts and was considerate, she was nicknamed "Jin Nang". In order to change her fate, she volunteered to help the new county magistrate Han Muzhi solve a major case. Since then, she stayed in the county government office and became a constable to assist in the investigation. In the process, she met Qi Menglin, a young man who wanted to travel around the world. Luo Shu is good at solving strange and bizarre cases, such as the cruel "headless female corpse case", the bizarre and bizarre "Fenhe naked corpse case", and the unpredictable "wine shop murder case"... Ten strange folk cases were staged one after another. Every time they saw the poor women in the case, Luo Shu and Qi Menglin did their best to help them get justice. As the unsolved cases were solved, the relationship between Luo Shu and Qi Menglin gradually heated up, but they didn't know that a bigger conspiracy was quietly approaching.