The reason the Qing Emperor had killed Mei Zhili was because Mei Zhili had betrayed the Qing Emperor, helped the Crown Prince, and participated in the struggle between the Crown Prince and the Second Prince. The Qing Emperor believed that Mei Zhili's actions were a betrayal and unforgivable. In addition, the Qing Emperor might also be worried that Mei Zhili knew something he should not know, so he decided to kill him. The Qing Emperor's goal in killing Mei Zhili was to show the Crown Prince his might and warn the other officials not to collude with the Prince. In summary, the Qing Emperor had intercepted and killed Mei Zhili because of his betrayal and participation in the palace struggles, as well as the Qing Emperor's worry about the confidential information he knew.
Hou Jichang betrayed Fan Xian because he wanted his future. During Fan Xian's most difficult period, his political enemy, He Zongwei, continued to suppress him. Hou Jichang chose to defect to He Zongwei and cut ties with Fan Xian. Although his colleagues pretended not to care, they actually looked down on Hou Jichang. After Fan Xian passed the crisis, he found Hou Jichang to settle the score. Although he didn't kill him, he blocked his future. For Hou Jichang, who valued his future, this was more torturous than death. The other three students, Shi Chanli, Yang Wanli, and Cheng Jialin, were all loyal to Fan Xian and did not hurt him too much. Therefore, Hou Jichang betrayed Fan Xian because he chose to join Fan Xian's enemy for his own benefit.
There were many possible reasons for Yan Bingyun's betrayal of Fan Xian. Yan Bingyun's betrayal was to protect Qing Kingdom's interests. He and Fan Xian had discussed a plan. Through the act of betraying and killing Fan Xian, he would make the Second Prince and Xie Bian believe that he had already joined them. This was to become someone the Second Prince trusted and obtain more information to help Fan Xian take revenge. Yan Bingyun's betrayal was just a clever play. His true identity was one of the best spies in the Qing Kingdom. For the sake of the country, he was willing to lurk in the dark for years and successfully build a huge intelligence network. Therefore, Yan Bingyun's betrayal was for a greater goal and ideal.
Hou Jichang betrayed Fan Xian because he had made this choice for his own future and interests. When Fan Xian encountered difficulties, Hou Jichang chose to defect to Fan Xian's mortal enemy, He Zongwei, and cut ties with Fan Xian. Although Fan Xian did not kill him, he had blocked his future. Hou Jichang might have thought that following Fan Xian would not protect his own interests, so he made this act of betrayal. This decision made Fan Xian feel very disappointed. He felt pain from Hou Jichang's betrayal. Perhaps to him, this was more torturous than death.
There were many possible reasons for Yan Bingyun's betrayal of Fan Xian. One possibility was to protect the interests of the Qing Kingdom and Fan Xian's safety. He and Fan Xian had discussed a plan. Through the act of betraying and killing Fan Xian, he would make the Second Prince and Xie Bian believe that he had already joined them. This was to become someone the Second Prince trusted and obtain more information to help Fan Xian take revenge. The other possibility was for the stability of Qing Kingdom and the temptation of power. Yan Bingyun might think that by betraying Fan Xian, he could obtain a higher status and greater power, and thus better protect the interests of the country and the people. In addition, he might think that Fan Xian's actions or decisions posed a potential threat to the country and the people. However, the specific reason was not explicitly mentioned in the search results provided.
We can conclude that the reason why the Third Prince replaced the Crown Prince was because he decided to replace the Crown Prince's position and finally ascended the throne with the help of the heroine. In addition, the Third Prince was also chosen because the Crown Prince had no foundation in the court, no help from his relatives, and his gentle and weak personality. He was not suitable to be an emperor who could unify the world.
The reason Hou Jichang betrayed Fan Xian was for his own future and interests. When Fan Xian encountered difficulties, Hou Jichang chose to defect to Fan Xian's mortal enemy, He Zongwei, and cut ties with Fan Xian. Hou Jichang might think that following Fan Xian would not guarantee his future. Although Fan Xian did not kill him, he had blocked his future.
The reason Hou Jichang betrayed Fan Xian was for his own future and interests. When Fan Xian encountered difficulties, Hou Jichang chose to defect to Fan Xian's mortal enemy, He Zongwei, and cut ties with Fan Xian. Although Fan Xian did not kill him, he had blocked his future. Hou Jichang might have thought that following Fan Xian could not protect his own interests, so he betrayed him. The other three students, Shi Chanli, Yang Wanli, and Cheng Jialin, were all loyal to Fan Xian and did not hurt him too much. Hou Jichang betrayed Fan Xian because he had chosen to join Fan Xian's enemy for his own benefit.
The reason Hou Jichang betrayed Fan Xian was for his own future and interests. When Fan Xian encountered difficulties, his political enemy, He Zongwei, put a lot of pressure on him. Hou Jichang chose to join He Zongwei and cut ties with Fan Xian. Although Fan Xian did not kill him, he had blocked his future. Hou Jichang had betrayed Fan Xian for his personal gain. This allowed him to find a new opportunity on the side of Fan Xian's mortal enemy in court. The other three students, Shi Chanli, Yang Wanli, and Cheng Jialin, were all loyal to Fan Xian and did not betray him. Therefore, Hou Jichang betrayed Fan Xian out of consideration for his own interests.
The reason Hou Jichang betrayed Fan Xian was for his own future and interests. When Fan Xian encountered difficulties, Hou Jichang chose to defect to Fan Xian's mortal enemy, He Zongwei, and cut ties with Fan Xian. Fan Xian had once thought very highly of Hou Jichang and had given him a lot of help, but Hou Jichang had betrayed Fan Xian for his own personal gain. Fan Xian did not kill him, but his betrayal had caused him to lose his future. Hou Jichang's betrayal was regrettable, especially at Fan Xian's most difficult time.