A long time ago, there was such a legend.
Plain girls can predict the rise and fall of a country and the changes of generations; at the same time, their joys, anger, and sorrows often affect the weather and climate, causing natural disasters. Their perception is several times that of ordinary people, and they can easily be influenced by external emotions and become trapped and unable to extricate themselves.
Therefore, in order to protect the prosperity of the country for thousands of generations, and at the same time pray for good weather and peace for the country and the people, the royal family imprisoned the plain girl and sealed her three senses, preventing her from seeing, hearing, and speaking.
However, this also brings a huge drawback, that is, the lives of ordinary women are lost, and each generation does not exceed the age of twenty. Therefore, before the prime girl reaches the age of twenty, her sleeping three senses must be awakened with the blood of the sealed family, so that the prime girl can complete her sex and give birth to a new generation of prime girls.
And all this is the great secret of the royal family.