Because Cao Cao is narrow-minded, and when Cao Cao is suspicious of him, he must get rid of this person. This person is Lu Bu, known as the most powerful general in the Three Kingdoms. Cao Cao's narrow-mindedness is famous in history.

The most famous one is that Cao Cao killed Lu Boshe. Cao Cao and Chen Gong fled together because of the failed assassination of Dong Zhuo. They had no way to go and were taken in by Lu Boshe's family when they were in danger. However, even though it was such a great favor, it was because Cao Cao aroused suspicion that they wanted to harm him. , and killed their family. He also said that famous saying, "I would rather let the world down than let the world down me", which is enough to show how narrow-minded he is.

Not to mention how much of a threat Lu Bu posed to Cao Cao. Lu Bu once captured Cao Cao's base camp by sneak attack, although he did not occupy it for long. But it has also led to a situation where the relationship between the two has reached the point where they are regarded as a fire and water, and when they meet, they both want to strangle each other to death. No matter how powerful Lu Bu was in martial arts, Cao Cao couldn't tolerate it. Then again, Lu Bu, no matter how powerful Lu Bu's martial arts is, his character is really not that good. Lu Bu can kill Ding Yuan for a red rabbit horse, and kill Dong Zhuo for a Diao Chan. Liu Bei, who took him in at that time, also ended up repaying kindness with hatred, and even used the purpose of occupying Xuzhou by threatening Liu Bei's family members.

Even his loyal subordinate Chen Gong could not gain Lu Bu's trust. In addition, Cao Cao also suspected that Lu Bu and Liu Bei had some unusual interests.

Not only was the suspicious Cao Cao unable to tolerate such Lu Bu, even an ordinary general could not tolerate him. After all, no one wanted to be the second Dong Zhuo.