Chen Yan, a graduate student in the Department of Modern History, was transported to the Three Kingdoms in an accident. At the time when Sima Yi was just entering his official career, he became an inconspicuous staff member under him. He has no extraordinary powers, and only relies on the solid historical context in his mind and his insight into the current situation of people's hearts to silently assist him.
From Cao Pi usurping the Han Dynasty to Cao Rui coming to power, he helped Sima Yi avoid disaster and seek advantage in the battle for the throne, and consolidated his foundation in the secret fight in the court; against Zhuge Liang's Northern Expedition, he provided precise logistics planning strategies to make up for the shortcomings of the Wei army; when pacifying Liaodong, he perfected the siege strategy to speed up the end of the war. He does not take credit or make any rash decisions, but always takes Sima Yi's decision-making as the core, skillfully correcting omissions in the historical process and resolving the hidden crisis in the Sima family.
With his assistance, Sima Yi and his son were able to accumulate power more steadily and avoid many historical traps. They finally completed the usurpation of Wei and Jin Dynasty during the Sima Yan period, sent their troops south to destroy Wu and Shu, ended the decades of war and disputes since the end of the Han Dynasty, and achieved unification of the world. With the wisdom of a mortal, Chen Yan witnessed and promoted the great cause of reunification in troubled times, and became a key driver behind the scenes in the Sima clan.
