Story summary: During the Zhenguan period of the Tang Dynasty, the Ninth Prince Li Xiuyi, known as the "Sick Yangzi", was indifferent and had no sense of presence in the palace. However, no one knew that in this frail body lived a soul from the future. He originally wanted to be an idle prince in peace and enjoy the peaceful and prosperous age of the Tang Dynasty, but there were always unsighted people and things coming to his door. Locust plagues, Turks, aristocratic families, conflicts in the court... In order to "lie down" safely, Li Xiuyi had to take action. By accident, he went from a sickly and weak prince who no one cared about to a world-famous and omnipotent prince.