Why did Kangxi like Li Hong? How did he become emperor?

It is said that Li Hong is very clever. When Kangxi saw Li Hong at first sight, he thought that he would make great achievements in the future. After Kangxi returned to the palace, birthdates of Li Hong was taken out for analysis, and the conclusion was that Li Hong's life was very good. Kangxi was very happy after hearing this, so he decided to take Li Hong to the palace to study and occasionally help Li Hong with his homework.

In the sixty-first year of Kangxi, Kangxi and Li Hong stayed in the summer resort, and their grandparents and grandchildren were inseparable. When Kangxi approved the throne, Li Hong was writing and grinding ink beside him. Kangxi sometimes got up and walked behind Li Hong and taught him to write. Even when discussing state affairs, Kangxi asked Li Hong to attend. Kangxi likes Li Hong very much because he is clever and studious. Later, Gan Long wrote Qing Bi Ting Nostalgia to recall this period of time. Li Hong is also very talented in riding and shooting. In Grace Cathedral, the summer resort, it is very good to mention Li Hong's archery. Kangxi was very happy and rewarded him with a yellow jacket.

Once, Kangxi and Li Hong went hunting together. Kangxi hit a big black bear with a musket. He asked Li Hong to shoot arrows. If the black bear dies, it's Li Hong's credit. Li Hong went with an arrow, but he didn't start. Kangxi was puzzled and asked Li Hong loudly why he didn't shoot the arrow. Li Hong responded by pulling the arrow quickly. I saw the black bear pouncing on Li Hong, and all the ministers panicked. Kangxi quickly shot and killed him. Later, Kangxi was very emotional about this matter. He thinks Li Hong is a very rich man. On one occasion, Kangxi summoned Li Hong's mother Niu Road. After seeing her, Kangxi said that Niu Zhilu was also a rich man.