Kangxi witnessed Yongzheng dying from exhaustion on the imperial court, and returned to the Qing Dynasty to teach his sons overnight. He wanted to change the princes. More importantly, he found that he not only felt sorry for Yinzhen, but also wanted to take it for himself, so that he only had eyes for himself!
Please take a leave. I have been busy with graduation recently, so I may update from time to time. Don't worry, the most important thing is that you won't get into trouble.