Li Daoyun traveled to the Warring States Period while repairing his family tree on a thunderstorm night, discussed Taoism with his ancestor Huanyuan, and proposed the "Quantum Taoism". The content of the discussion was heard by Qin Wangzheng, who visited privately incognito, which aroused his interest in Taoist thought of governing the country. Li Daoyun was forced to participate in the Qin government and use modern knowledge to improve agriculture and military while fighting against the Legalist forces. Finally, after completing the historical mission, he discovered the connection between the secrets hidden in the family tree and his own destiny.
