Chen Xuan, a top student in the Department of Modern History, transformed into Li You, the ninth prince of the Tang Dynasty, Li Shimin, through a bizarre time travel. Before he could fully adapt to ancient life, the "Datang Hegemony System" was bound to his mind, and he began his counterattack in the Tang Dynasty.
When he first arrived, Chen Xuan faced the test of the royal hunting. With the help of the system and his own wisdom, he showed his talents in the hunting grounds. Not only did he capture many prey, but he also captured a rare white fox alive. He won praise from Li Shimin and received generous rewards from the system. Since then, he has become famous, but it has also attracted the jealousy of other princes and undercurrents in the court.
In the palace library, Chen Xuan met Su Yao, a gentle and talented girl. The two became attached to each other through poetry and songs, and their love gradually grew. However, Su Yao's father was framed by a traitor. In order to protect his lover, Chen Xuan used the system to find out the truth, successfully cleared his grievances, and his relationship became deeper.
When leaving the palace, Chen Xuan got acquainted with Liu Yiyi, a bold woman from the world. Liu Yiyi was bullied by gangsters, Chen Xuan came to help, and Liu Yiyi moved into the mansion. As they get to know each other more and more, Chen Xuan discovers that she has an important responsibility as a teacher and a mysterious jade pendant. The two work together to travel around the world, and their relationship quietly heats up.
Facing Su Yao's gentleness and delicateness and Liu Yiyi's forthrightness, Chen Xuan fell into emotional entanglements. But before he could resolve his emotional problems, the system continued to release new tasks. From assisting Li Shimin to solve people's livelihood problems, to dealing with diplomatic disputes, and expanding Datang's trade territory, every step was full of challenges. In the court, the prince Li Chengqian, the fourth prince Li Tai and others repeatedly made things difficult and secretly made trouble; in the rivers and lakes, there were also unknown forces ready to move.
