Junior high school teacher Zheng Dazhi divorced his wife because he suspected that his wife had an improper relationship with Director Liu of the Education Committee. After the divorce, he lived alone with his son Xiaonan. He was both his father and his son's teacher. But when Zhang Meng, a student of Zheng Dazhi, saw other students' parents giving gifts to Zheng Dazhi, he misunderstood that Zheng Dazhi was a snobbery who disliked the poor and loved the rich. Zhang Meng's family conditions were poor, so he harbored a grudge against Zheng Dazhi, often bullied Xiaonan, and eventually killed Xiaonan. Zheng Dazhi suffered from depression as a result, but with the help of his student Ding Puyu's mother, Ding Qing, he got through the difficult period. But Zheng Dazhi still carried out his revenge plan because of an opportunity...
