What is the film Judge Mom about?

Zhang Shuai, a boy of 15 years old who lives in a single-parent family, faces a legal ruling for burglary. His family tried to give trial judge An Hui 20,000 yuan through lawyer Li who defended him, but was secretly embezzled by lawyer Li. Zhang Shuai was sentenced to three years, during which his mother died. After Zhang Shuai was released from prison, he was determined to take revenge and collect evidence of An Hui's bribery. But after Zhang Shuai was rejected by his father and stepmother, An Hui took him into her home and helped him find a job. Zhang Shuai found a circle around his hometown in Anhui and installed a bug. Anhui's kindness, attitude towards juvenile delinquents' families and meticulous concern for himself made him doubt his plans instead of finding anything suspicious. Later, Zhang Shuai learned from the hospital that her mother sold her kidney for him and got a huge sum of money for Anhui. Zhang Shuai rekindled his anger and submitted the collected evidence to the procuratorate. Anhui was suspended. An Hui calmly told Zhang Shuai that she was innocent, and she was even glad that Zhang Shuai could solve the problem through legal means. Three days later, An Hui celebrated Zhang Shuai's 18 birthday and invited Zhang Shuai's father. Just then, Uncle Zhang sent Hui a letter from Zhang Shuai's mother, which was hidden in the sofa. There was a passbook in it, and the truth finally came out. Zhang Shuai left the city with his mother's ashes, and he wanted to start a new life. An Hui arrived at the railway station after hearing the news. Although we didn't meet, Zhang Shuai knew from her heart that she was her mother.