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At the end of the ninth year of Takeori, the soul of a nerdy engineering student transformed into Li Tai, the son of Emperor Taizong. He was cautious when he first arrived and used his engineering knowledge to change the Tang Dynasty bit by bit. However, with his half-experience in history, he was tricked by his father, bullied by his mother, robbed by courtiers, quarreled by aristocratic families, and sealed by scholars...