Li Yifan, a modern social animal, died suddenly while working overtime and traveled through time to become a fake eunuch in the East Palace of the Dawu Dynasty who was recorded but never purified. On the day he entered the palace, his handsome face and over-age conversation aroused the alarm of Crown Princess Su Yuening. Caught between various forces in the East Palace, Li Yifan relied on modern historical knowledge and meticulous strategic thinking to avoid danger time and time again.
From attending to the princess's grooming to getting to know the eldest princess Li Yao and the female general Qin Shuang, and then forming an alliance with the pure and kind palace maid Dong'er, Li Yifan traveled among the four women. Prince Wu Chengqian had a distorted temperament due to his infertility, and secretly planned a coup to seize the throne. Li Yifan used his fake eunuch identity to sneak into the information center and repeatedly broke the situation. Finally, on the night of the coup, he joined forces with Qin Shuang to protect him and regained his freedom.
Later, Li Yifan entered the court as an official, defeated the barbarians in the northern border, reformed the government in the court, and established a camp at every step. When the emperor died and the princes seized the throne, he joined forces with Qin Shuang to put down the rebellion, established the young emperor, and was named regent. A few years later, the world returned to its original state, the young emperor abdicated on his own initiative, and Li Yifan ascended the throne to create a new dynasty.
Four confidants are queens, each showing their talents: Su Yuening is in charge of internal affairs, Dong'er is in charge of the harem, Li Yao is in charge of diplomacy, and Qin Shuang is in charge of military affairs. After the world was settled, Li Yifan pushed forward the constitutional monarchy against all opinions, promulgated the "Xinwu Magna Carta", actively restricted the imperial power and established the Council, creating a prosperous era unprecedented in history. In his later years, he sat with his descendants and looked back on his life - from the humblest false eunuch to the founding king of the country. He lamented that the most precious thing was not the crown, but the people who accompanied him throughout the journey.