Duke Uncle Yun, in order to have a Yun Family woman become the Empress, actually devised plans to ruin the reputation of several other candidates for the Crown Princess Consort!
At that time, the late emperor was selecting a consort for the Crown Prince, among whom were several women whose appearance, family background, and character were not inferior to the current Empress.
The current Empress was merely one of the alternatives.
Duke Uncle Yun first secretly pushed one woman into the river and had prepared a concubine-born son of the Yun Family beforehand to rescue her, and because her clothing was disheveled and there was physical contact, the woman had to marry the Yun Family concubine-born son.