During the Yuan Dynasty, Mongolian rulers forced Mongolians to enjoy the first night marriage of Han people, not only to satisfy their desire for conquest, but also to change their bloodline. However, both Mongolian and Han people believe this. As long as the vagina is broken, the child born will be bleeding from the vagina breaker. Therefore, the Han people at that time also thought of countermeasures. In the earliest period, when Han men and women were preparing to get married, as long as the parents of both men and women recognized the matter and asked the matchmaker to witness it, the prospective uncle could first break his wife's place, then give her to Chang Bao for enjoyment and then send her back. But the Mongols soon discovered the conspiracy of the Han people. Under the cruel rule of Mongols, there was no reason at all. As long as a married woman is sprouted by Mongols, as long as the executor thinks that the woman is wrong, both married men and women will be executed. For this reason, the Han people have formed the custom of killing the first child, but tiger poison still doesn't eat children. Every time the Han people kill a child, their hatred for the Mongols rises.