Zheng Zhuanggong and his two brothers, their mother Wujiang, gave birth during childbirth, so she didn't like him and named him "Sheng Mao". On the contrary, she dotes on her younger brother Shu Duan in every way. According to the ancient system, Sheng was the eldest brother and naturally inherited the throne and became the monarch of Zheng. Wu Jiang, the mother, was even more dissatisfied and tried every means to cultivate Shu Duan's influence so as to replace Zhuang Gong when she became strong. So she asked Duan Shu for land and wanted to build a city (now Zhengzhou is on the street). Zhuang Gong disagreed, and Wujiang asked him to seal Duan Shu to Jingxiangcheng (now Xingyang), and Zhuang Gong agreed. After Duan Shu arrived in Beijing, he called the uncles of the capital, recruited soldiers, built the city wall, and prepared for rebellion. After learning about it, the Qing Dynasty told Zhuang Gong, who said, "What does it matter as long as my mother's military commander is willing?" Ji Zhong said: "When Wujiang is dissatisfied, it is better to put them in a suitable place as soon as possible, otherwise it will be difficult to handle." Duke Zhuang said, "If you do more injustice, you will die. You wait and see! " In the twenty-second year (February 72 BC), Duan Shu thought the time was ripe, so he discussed with his mother the date of starting his army. After Wujiang made a decision, he wrote a letter to Uncle Duan, asking him to immediately arise and be his own insider. By this time, Zheng Zhuanggong had discovered their plot and intercepted this secret letter. After obtaining these evidences, Gong was immediately sent to lead two hundred personnel carriers to surround Jingxiangcheng. Uncle Duan was caught off guard and fled to Yanling, and was forced to flee to * * * City (now Huixian County, Henan Province) to commit suicide.

Since then, Zhuang Gong has been more dissatisfied with Wujiang and threatened to "rest until death". Zhuang Gong sent Wujiang River to Yingdi (now Dengfeng, Angelababy) to live. After a while, Zhuang Gong regretted it. When he hosted a banquet for Uncle Ying Kao, an official in charge of the land, Uncle Ying Kao wanted to reconcile the relationship between their mother and son, so he hid some delicious things in his sleeve during the dinner. Zhuang Gong was very surprised and asked, "What does this mean?" Uncle Ying Kao said, "My mother hasn't eaten the food given by the monarch in the country all the year round. I want to take some home to show my filial piety. " Zheng Zhuanggong talked about the breakdown of his relationship with his mother. Uncle Ying Kao said, "This is easy to handle. We can dig a tunnel to the grave and build tunnels and courts. Can you satisfy it? " Deeply impressed by the appropriateness of this law, Zhuang Gong entrusted Uncle Kao to handle this matter. So Uncle Ying Kao acted quickly and soon dug a tunnel in Xiangcheng, Beijing, and invited Zhuang Gong to meet his mother. After the mother and son met, they cried and made up. This is the origin of the famous story of "Digging Mothers".

Don't copy it all, just summarize it.