A modern young man, Leo Leon, has an accident and his soul travels a thousand years back in time, arriving in the Great Tang Empire. He is transformed into the son of the Prince of Qin, Simon Leon. He uses his modern wisdom and humor to quickly become an indispensable member of Simon Leon's brain trust. Facing intrigue, Leo Leon uses his insight and strategies to resolve crises, solidifying the Prince of Qin's position and clearing obstacles for his father's path to the throne.