The protagonist Li Jin, who was originally a double major in history and computer science at a top modern university, accidentally traveled through time and became the sickly legitimate son of Emperor Taizong Li Shimin of the Tang Dynasty during the Zhenguan period. Well aware of the cruelty of the Tang Dynasty prince's "gu-raising style" struggle for the throne, he used "frailty" as a disguise to secretly accumulate strength in Weiyang Villa, used modern knowledge to connect aristocratic families, infiltrate military power, and finally succeeded in succeeding to the throne.
After ascending to the throne, he betrayed the family covenant and broke the family's monopoly with institutional innovation and technological empowerment. He also formed an ocean-going fleet to explore the world and built the Tang Dynasty into an "empire on which the sun never sets" across Europe, Asia, the United States and Africa. He was given the temple title "Holy Sect" and became the legendary emperor who ended the destiny of the Xuanwu Sect and reshaped the world structure. The novel combines the meticulousness of the game of power and the grandeur of empire expansion, showing the prosperous scene of the collision between modern thinking and ancient society.