Something strange happened in the imperial court of Yan State. In the past twenty years, only a princess was born, and the position of the prince has been vacant. Is it God's will or a conspiracy? Can the royal bloodline living among the people return to the imperial court and unify the country? What conspiracies and maneuvers will he face? Can true love withstand the cruel test? In the end, will Lao Yan be separated or will the case be brought together?