Kangxi was the initiator of the Nine Sons' seizure of the throne, because Kangxi failed to educate the Prince, so that the Prince was abolished and other brothers competed for the throne. Yin Ren's mother was Empress Xiao Chengren, but her beauty died young, but this did not change her position in Kangxi's heart. Empress Xiao Chengren accompanied Kangxi from the sovereign to the king, and their feelings were unparalleled, so the children born to Empress Xiao Chengren were very popular with Kangxi. After the death of Empress Xiao Chengren, Kangxi was very sad. He felt that he didn't take good care of Empress Xiao Chengren, which is why Empress Xiao Chengren died so early. So he put all his guilt about Empress Xiao Chengren on Yin Ren. When Yin Yong was only one year old, he made Yin Yong the Crown Prince, and he often went to Yin Yong himself. Yin Yong got chicken pox when he was four years old, and Kangxi took care of him when he was not in court for half a month. This shows Yin Yong's position in Kangxi's heart. Kangxi's preference for Yin Ren also aroused the dissatisfaction of other concubines, who were all children of Kangxi, and the difference was so great. However, excessive doting is very unfavorable to Yin Ren. She lost her mother very early, so she lacks her mother's teaching, and her mother plays a great role in a child's life. Yin Yong gradually became lawless and violent, because after he knew he had done something wrong, Kangxi wouldn't punish him at all. Kangxi fell ill in the battle of Gerdan, but Yin Yong saw Kangxi without any sadness. Even when his younger brother died on May 18, Yin Yong looked expressionless. Kangxi felt very chilling. His carefully trained son is so cold-blooded and heartless. How can he feel at ease when he hands over the country? So Kangxi abolished the prince, and after the position of the prince was suspended, other outstanding brothers would naturally have the idea of taking the position. Kangxi was the initiator of Jiuzi's accession to the throne.