In 2218 AD, Dr. Peng, who majored in both physics and computer science, invented the historical retrieval machine. In the virtual digital universe, Tang Taizong Li Shimin was reborn in Tang Zhaozong Li Ye. At the same time, Li Ye also returned to this body after experiencing failure in one life. Two generations of emperors live together. Facing the difficult situation of the Tang Dynasty, is it that the root of the era's disease has already penetrated deep into the bone marrow, or is Li Ye's original talent not enough to survive? Can Li Shimin use the talents and strategies of a wise king to change his destiny and rebuild the Tang Dynasty? And in the quagmire of failure, what kind of lessons can Li Ye learn from Taizong, find his own crux, assist Taizong, and fight for rebirth together?