[Imagine the dynasty, use your imagination, and change roles] Huaiqin is the only bloodline of the royal family of the two dynasties (named Zhu Beier before time travel). In order to maintain the stability of the country and the safety of the people, he pretends to be a man and inherits the throne. Due to his beauty, he almost turns from a "prince" to a "favorite concubine" of an enemy country with a long-yang addiction and a faint king. After experiencing twists and turns, he finally saves the country and gains growth and love.
