It can be said that it was caused by a misunderstanding. In defending the capital, Xu Youzhen advocated moving the capital to avoid war, saying that it was an act of God (because he had seen the celestial phenomena). Yu Qian advocated that the capital must be defended, and he was also supported by the acting emperor (later Zhu Qiyu, Emperor Taizong of the Ming Dynasty) and ministers of the Manchu Dynasty. After defending the capital, Yu Qian made great contributions and became the emperor's favorite. In order to return to the high position, Xu Youzhen found Yu Qian, hoping that he could help himself. Yu Qian wanted the recommendation of the Emperor (Zhu Qiyu) very much. The Emperor knew that he advocated moving south in order to defend the capital, so he didn't reuse it. However, Xu Youzhen thought that Yu Qian was a hindrance, and he hated it from then on. In the eighth year of Jingtai, when Zhu Qiyu was dying, Xu Youzhen planned a coup to welcome Zhu Qizhen (Yingzong) back to the palace as emperor. You killed Yu Qian on the charge of "intentional".