Why was the ending of the historical novel I Am King criticized by so many people?

I Am King in the Spring and Autumn Period is a historical novel. The reason why its later ending was criticized was mainly because of its flaws in dealing with history and the relationship between characters. In the novel, the protagonist Wang Yunfei eventually became the emperor of the Qin Dynasty. He successfully unified the six countries through a series of political means and became the first unified emperor in Chinese history. However, his rule did not gain the support and trust of the people, and the rule of the Qin Dynasty fell into the predicament of internal division and external invasion. In the end, Wang Yunfei was assassinated and the Qin Dynasty was destroyed. This ending gave people a very absurd and illogical feeling. In the novel, what was Wang Yunfei's motive for unifying the Six Nations? How did he gain the support and trust of the people? Why did his rule lead to internal division and external invasion? None of these questions had been answered reasonably, so people could not accept this outcome. In addition, there were some problems with the description of the Qin Dynasty in the novel. The Qin Dynasty was portrayed in the novel as a cold, cruel and dictatorial ruling machine, which did not match the real history. Although the Qin Dynasty was a unified country, it also had some problems and contradictions such as land distribution, legal system, etc. In the novel, these problems were ignored, which led to people's unreasonable imagination. Therefore, the main reason why the later ending of the Spring and Autumn Period was criticized was that it had flaws in dealing with history and character relationships, as well as problems in describing the Qin Dynasty.