Some malicious people tried their best to become a generation of kings, so Zhao Gao imitated Qin Shihuang's notes and wrote a letter in which Fu Su committed suicide. When Fu Su saw the letter, he really believed it and was very sad. He slowly took the letter and sadly believed it was true, so Fu Su committed suicide.
In ancient times, many immediate family members would kill each other. In order to get the throne, they used many tricks to let their brother die, so that they could get the position of emperor. So Zhao Gao wrote a letter under the guise of Ying Zheng, and Fu Su committed suicide. Zhao Gao used Ying Zheng's hand. Their notes must be very similar. Fu Su will think that his father wants to die.
Zhao Gao is diligent in both work and study, and he is well versed in legal knowledge. On one occasion, Zhao Gao once committed a felony, through his own rhetoric, using the law he was proficient in. Finally, Qin Shihuang asked him to return to his original position; So, Zhao Gao is so smart that he will definitely spend a lot of thoughts on Qin Shihuang's handwriting and kill people invisibly through letters. I hope the above viewpoints can help you.