Why did Yongzheng and Nian Gengyao change from good brothers to enemies in history?

In the early years of Yongzheng, Nian Gengyao played two major roles.

The first is the 14th May Chen Yun, who took over the position of the then General Wang. The second time was in the first year of Yongzheng, and the rebellion of Rob hiding Tenzin broke out in Qinghai. Nian Gengyao is duty-bound to defend the country. Of course, he wanted to rebel, and then he succeeded in World War I, and Yongzheng appreciated him very much. Yongzheng is a man who knows the emperor's art very well. For such a heavily armed and extremely important courtier, he tried his best to win over. However, his method is also very common. One is to promote the title and make Nian Gengyao a first-class duke, which is very rare among Han people.

In February of the third year of Yongzheng, Nian Gengyao wrote to the emperor.

There is a word in it called "morning exercise and evening admonition", but Nian Gengyao wrote it backwards and wrote it as "Xi Di Chao Gan". It means that the emperor is diligent and cautious all day long, without any negligence or slack.

Yong Zhengdi was furious and said that you wrote "Xi Di Chao Gan" as "Xi Di Chao Gan". Doesn't that mean I quit? Since you don't promise me to do things in the morning and at night, whether you are allowed to do military service or not is undecided. From then on, Yong Zhengdi began to play cat and mouse with Nian Gengyao and began to torture him.

The Relationship between Yongzheng and Nian Gengyao

There is a good beginning, but there is no good ending, and the relationship is very complicated. At first, Yong Zhengdi took the initiative to jump, with no bottom line and no reservation, and went to get close with a bang. Since I am close to you, all the people close to me will be as close to you as I am, and you will be able to sleep together, regardless of each other.

Later, we two brothers drank together. I'll make it first, and then I'll see how you drink it. If you just say, I'm sorry, I'll turn against you. Then, once you turn your face, you will never forget the old feelings, and I will kill you.