In a parallel world of the Tang Dynasty that is slightly different from the history we are familiar with, seventeen years after Zhenguan, Li Shimin's health gradually declined in his later years, and undercurrents surged in the court. All forces are ready to move, and the battle for the throne among the princes is becoming increasingly fierce. Although social productivity has developed, there is still much room for improvement, which provides a broad space for a man from modern science and engineering to travel through time and start a farming business as the tenth prince.
