The reason is that Zhou Yu and Sima Yi have different personalities and backgrounds, so they became two people. Sima Yi and Zhou Yu both came from rich families or loyal ministers of the former dynasty, but their experiences were different. Zhou Yu is a brave general in Jiangdong, and Zhou Lang is the representative of Wu Dong. After Sun Ce's death, he could completely replace Sun Quan, but Zhou Yu chose to continue to assist Sun Shi. On the other hand, Sima Yi, when Cao Cao needed talents especially, forced him to join the army as an official, and then each had his own abacus. Cao Cao was always wary of Sima Yi. In this context, Sima Yi learned to forbear, and finally he usurped Cao Zhi. Instead, Zhou Yu was finally angered by Zhuge Liang because of his arrogance. Although they are all military geniuses, different experiences have produced different results.

During the dispute between the Three Kingdoms, each military genius showed his magical powers. Battle of Red Cliffs and Zhou Yu defeated Cao Cao's 800,000 troops, so that Cao Cao could never go south again. Sima Yi, whose art of war is also very powerful, originally needed a month's marching time to expedition to Mengda, and finally it took only eight days to get to Xincheng and behead Mengda, who was not well guarded. The military ability of the two of them is obvious to all, but the situation makes heroes, and the results are different. One of them is angry, while the descendants of the other have established their own dynasty.

When Sima Yi was in power of Cao Cao, Sima Yi was restricted everywhere. After Cao Pi and Cao Rui dynasties, the mountains and rivers in Cao Zhi were controlled by Sima Yi. When Cao Zhi was incompetent, Sima Yi held the power of Wei. Thanks to his forbearance in the early stage, Cao Cao could not see his true skills.

For Zhou Yu, although he is a general in Jiangdong, he is very jealous of talented people, which makes Zhuge Liang very angry. If he wanted to be like Sima Yi, the result would not be like this.