The main reason why these two men turned against each other was that Sun Kewang's selfish desires were too great. At that time, Liu Wenxiu Shuaijun was cleaning up the Qing army, and Wu Sangui and his party retreated to Baoning City for fear. Liu Wenxiu immediately asked the soldiers to surround them outside the city. At that time, Liu Wenxiu's men advised him not to do so. If the siege would lead to the dispersion of their own forces, Liu Wenxiu went its own way, but they finally found a loophole in Wu Sangui, causing Liu Wenxiu's troops to flee everywhere.

Liu Wenxiu fled back to Guiyang because of the defeat, and Sun Kewang was very angry when he learned that he was defeated. But what Liu Wenxiu didn't expect was that Sun Kewang actually took back the relieving in his hand, which also caused the gap between the two. After all, Liu Wenxiu did his best to help Sun Kewang establish his prestige at that time, but now he just took back the relieving after one battle, which made him feel that the brotherhood between them was worthless in Sun Kewang's eyes.

In fact, at that time, Sun Kewang wanted to be emperor himself. At that time, Liu Wenxiu advised him not to compete for the throne in this troubled times. Later, a series of things happened. Sun Kewang's dream of the emperor was shattered. He was very angry and ran away with his troops. At that time, it was Liu Wenxiu who pursued him. When Liu Wenxiu caught Sun Kewang, he let him go because he cared about his years of brotherhood. However, after hearing others analyze the pros and cons of letting Sun Kewang leave, he regretted it.

Later, in order to consolidate the internal stability of the country, some people proposed a discriminatory policy towards the former headquarters in Sun Kewang. At that time, Liu Wenxiu objected, but they thought that Liu Wenxiu was an imitator of Sun Kewang. After this series of events, Liu Wenxiu was very disappointed and died of depression soon.