Modern history researcher Chen Yan accidentally traveled through the late Eastern Han Dynasty and joined the army of Liaodong Gongsun Kang. At that time, although the Gongsun family ruled in Liaodong, they were deeply troubled by internal and external troubles - the Wuhuan and Xianbei raids in the north, and the spying forces of Cao Cao in the south. The internal armaments were depleted and there was a shortage of food and fodder. Chen Yan had no extraordinary powers, but he gradually gained Gongsun Kang's trust based on his familiarity with the situation in the late Han Dynasty and his pragmatic strategies.
He first proposed the strategy of "consolidating the border and cultivating grain" to rectify military discipline, promote drought-resistant crops, and help Liaodong store grain and strengthen the army; then he recommended the strategy of "approving the barbarians and uniting the weak" to appease Goguryeo, divide the Xianbei tribes, and stabilize the rear. When Cao Cao went to conquer Wuhuan in the north, he urged Gongsun Kang to avoid his superiority and preserve his strength. When the Central Plains fell into a melee between Wei, Shu and Wu, he also made suggestions to go south to collect the remnants of Youji and encroach on the territory of the Central Plains.
In the end, Chen Yan assisted Gongsun Kang, based on Liaodong, and worked step by step to break the stereotype of a divided world, gradually wipe out the heroes, promote the unification of the Gongsun family, and rewrite the historical trajectory of disintegration in the late Han Dynasty.
