Chen Yan, a graduate student in the Department of Modern History, accidentally time-traveled to a time that coincided with the twelfth year of the founding of the Shu Han Dynasty. Zhuge Liang died of illness in Wuzhangyuan. The national power of the Shu Han Dynasty was declining, and internal and external troubles were intertwined. He joined Liu Chan's staff, and he had no extraordinary abilities. He only relied on his accurate insight into the general trend of the Three Kingdoms, and started from the bottom of the staff.
Faced with the critical situation of party strife in the court, poor people's livelihood, Cao Wei's pressure on the situation, and Soochow Wu's wait and see, Chen Yan took history as a mirror and offered suggestions to rectify the administration of officials, promote mulberry farming, and improve armaments, assisting Liu Chan to abandon ignorance and unite people's hearts. He united with Jiang Wei to stabilize the military power, appease the southern and central tribes and stabilize the rear, and even used virtual reality to break Cao Wei's strategic blockade in key battles.
From a corner of Yizhou to Zhulu in the Central Plains, Chen Yan worked side by side with the Shu Han monarchs. After more than ten years of iron-blooded battles and internal political reforms, he bucked the trend in troubled times, reversed the decline of Shu Han step by step, and finally defeated Wei and Wu, restored the glory of the Han Dynasty, and let the "Han" flag spread across the nine states, creating a unique legend of the unification of the Three Kingdoms.