When Qianlong misunderstood the main hall and Liu Tongxun abused power for personal gain, Liu Tongxun was an honest official, but he did not change his original intention. In order to prove his innocence, he wanted to kill his three sons one by one with a hay cutter. The eldest son and the second son were trapped by Liu Tongxun's ethics of "monarch, minister and son" and were forced to die for filial piety.

But Liu Yong was not framed by ethics, so he ran away in a hurry to save his life. He met the Queen Mother and asked her for help (Liu Yong should have been a child at that time). The Queen Mother asked why Qianlong persecuted Liu Tongxun, named Liu Yong "Her Royal Highness", worshipped Qianlong as "dry brother" and "made him three thousand years old". From then on, Liu Tongxun never killed Liu Yong again.

Historical data record:

Liu Tongxun wanted to retire, and was asked by Qianlong Opera: "You have been loyal and honest all your life. If your son doesn't be a loyal minister in the future, won't it ruin your reputation in Liu Tongxun? " .

Hearing this, Liu Tongxun immediately called his third son to court and beheaded his second son in front of Emperor Qianlong. Liu Yong was desperate and begged the queen mother to save him, so he was named "Your Highness Yurgan, and he was three thousand years old." From then on, no matter which official Liu Yong met, except members of the royal family, he was one level higher than this official and very beautiful.