The Dayong Dynasty was founded for more than a hundred years. After the two generations of Taizu and Taizong worked hard to govern, they created the "Yongjing Dynasty". By the time of Emperor Sejong, the dynasty was still peaceful on the surface, but in fact there was an undercurrent. The game between the imperial power and the aristocratic families is becoming increasingly fierce. The "Northern Barbarian" tribes in the northern grasslands have taken advantage of the situation to rise and frequently invade the borders; along the water transport routes in the south, people's livelihood is gradually declining due to official corruption and frequent floods; in the west, the "Xilong" vassal towns hold military power. Although they nominally submit to the imperial court, they secretly cultivate their power.
Although the imperial examination system of the dynasty has matured, the children of aristocratic families occupy most of the official resources by virtue of their hidden privileges, and the promotion channels for scholars from poor families are narrow. In terms of ideology and culture, Confucianism is still orthodox, but Taoist health-preserving techniques and Mohist craftsmanship are also spread among the people. Some aristocratic families even secretly studied the military strategies of the previous dynasty, hiding their intentions for restoration. In addition, there is a mysterious organization "Tingfeng Tower" in the arena, which makes a living by selling intelligence. Its tentacles extend all over the government and the public, becoming an invisible force that affects the situation.