Zhang Wenda, a scribe from Pingyang, Shanxi Province, his wife Sun Shulin and their two sons were separated by the Jin soldiers while fleeing. His wife, Sun Shulin, was living in poverty in a shop and was unable to repay her debts. The eldest son was sold by the shop owner to the Chang family of a foreign minister and named Chang Tianbao, while the second son was adopted by the Zhou family and named Zhou Ziqing. A few years later, Sun Shulin, who was aging prematurely, came to Luoyang City in search of her husband and son. Because she was good at cooking "Bazhen Soup", she was hired by the housekeeper of the Chang Mansion as a cook to cook the Bazhen Soup for the prefect Chang. Unexpectedly, it turned out that the prefect was actually Shu Lin. The eldest son who was sold to the Chang Mansion by a shopkeeper changed his name to Chang Tianbao. The magistrate wanted to recognize her, but he was afraid that the fourth-grade official would be guilty of deceiving the emperor by buying her as a slave and hindering his future, so he refused to recognize his mother. Poor Shulin was kicked out of the Changfu and lived in the backyard of the magistrate Zhou Ziqing, where he wanted to hang himself from a beam. After being rescued, Mrs. Zhou comforted her with gentle words, and heard Sun cry and tell her reasons, just like what happened to her mother-in-law. Sun Shulin also received care from Mr. Zhou. Ziqing returned home and was overjoyed, and mother and son were reunited. Immediately after hearing that his brother was disobedient and unfilial, he went to the magistrate's office to seek explanation from his brother, but Chang Tianbao and his wife persisted in their stubbornness. Zhou Ziqing was angry and sued the prefect Chang Tianbao and his wife to the seven provinces patrol station. The investigation was conducted in accordance with the law, all witnesses and witnesses were found, Sun Shulin and Zhang Wenda were reunited, and their parents and brothers scolded the unfilial son Chang Tianbao.