Li Mingyue is a modern orphan with a terminal illness. To pay for her medical bills, she takes part in a dangerous experiment. After a chip containing knowledge from across China’s past and present is implanted in her, she dies in an accident, only to transmigrate to the early Zhenguan era of the Tang dynasty as the daughter Li Shimin and Empress Zhangsun left behind. The chip connects perfectly with her brain, giving her the ability to “foresee” things. However, the old powers are determined to protect their own interests and do everything they can to stop Li Mingyue from using her knowledge to help the Tang dynasty develop. If she fails, the Tang dynasty will miss its chance to achieve greatness and be plunged into internal and external crises. Newly arrived in this era, Li Mingyue is unfamiliar with ancient affairs, which often hampers her actions. At the same time, the opposing factions force her to struggle to choose a side between the old and new powers. The old guard misunderstands her modern ideas and behavior, secretly sabotaging her plans and creating a crisis of trust between her and some old friends. But with her unyielding resolve and the help of her allies, Li Mingyue continues to overcome crises under tight time constraints and drive reforms in the Tang dynasty. Though she ultimately succeeds in leading the dynasty to greatness, she must also bear the bitter cost of estrangement from old friends.