Toppling a city with a single sword

In the early years of the Ming Dynasty, the Prince of Yan, Zhu Di, launched the Jingnan Campaign and killed his nephew, Zhu Yunwen. Zhu Yunwen's important ministers, Tie Xian and Fang Xiaoru, were also killed. Zhu Di's minister Jing Qing, out of righteous indignation, tried to assassinate Zhu Di, but was skinned and executed. Zhu Di proclaimed himself the Emperor and was known as the Yongle Emperor.
Twenty years later, Yongle Emperor Jiangshan is stable, Jin Yi Wei Zhenfu makes Li Jincheng accidentally involved in a series of cases, but discovered a huge conspiracy.