First of all, Yu Xun provided a stable rear for Cao Cao. After Cao Cao got Yu Xun, he adopted the "dual-core model", that is, Cao Cao dominated the outside and Yu Xun dominated the inside. As long as Cao Cao goes to war, he must be Yu Xun's housekeeper, and whenever Cao Cao encounters a crisis, he will ask Yu Xun for advice.
For example, in the battle of Guandu, Cao Cao was overwhelmed and wrote to tell Yu Xun that he wanted to go home! Yu Xun immediately wrote back to dissuade him: You are difficult, and Yuan Shao is also difficult. Stand up for change! Finally let Xu Youlai vote and open the door to victory.
Secondly, Yu Xun provided a large number of outstanding talents for Cao Cao. Cao Cao commented on Yu Xun's famous saying: if literature is good, it will not stop. This is more about talent recommendation. Such as Guo Jia, Sima Yi and Zhong You. All of them are excellent talents recommended by Yu Xun to Cao Cao, which makes Cao Cao take the lead in the talent competition.
Third, Yu Xun is the buffer between Cao Cao and Emperor Xian of Han Dynasty. The contradiction between Cao Cao and Emperor Xian of Han Dynasty is very deep, and Yu Xun is the buffer between them.
Therefore, from this perspective, Yu Xun is not only the last barrier of the Han Dynasty, but also reduces the damage to the majesty of the Han Dynasty to some extent. At the same time, it became Cao Cao's biggest "fig leaf", so that Cao Cao Can bragged and forced him: Without me, I don't know how many people in the world called me emperor. Who said I was a Han thief?
But to the anger of many people, Yu Xun was finally forced to death by Cao Cao. Cao Cao gave Yu Xun an empty lunch box because he opposed Cao Cao's being king, and Yu Xun committed suicide. People have always been used to arguing about what this "empty box" stands for. Is it "cold dew, please commit suicide", or something else?
In fact, in my opinion, there is no need to interpret this "empty box" too much, because the outbreak of contradictions has always been a long-term accumulation process. The reason why Cao Cao and Yu Xun changed from the best partners to "enemies of life and death" is that these three women led to all this.
Things should start from the year 200! Two major events happened this year. First, the battle of Guandu broke out, and second, Cao Cao killed Dong Guiren, the wife of Emperor Xian of Han Dynasty. After Cao Cao killed Dong Guiren, he was frightened by Queen Fu. She wrote to her father Wan Fu to get rid of Cao Cao.
After reading the letter, Wan Fu knew that he could not defeat Cao Cao alone, so he came to Yu Xun with the letter. So, "(Xun) hated it and kept silent for a long time", that is, knowing that there could be no more trouble at the moment, and he hated doing anything, so he didn't say a word.
Seeing Xun's silence, Wan Fu took the letter to find his brother-in-law, Fan Pu. He didn't know that Fan Pu was Cao Cao's diehard, so Cao Cao finally knew about it.
Yu Xun naturally got the news there. Will Cao Cao kill Queen Fu again now? If so, it will be a disaster for Cao Cao and the Han Dynasty! So Yu Xun thought of the third woman, Cao Cao's eldest daughter: qinghe princess. Find Cao Cao and "persuade Mao (Cao Cao) to match women with the emperor". That is, qinghe princess was betrothed to Emperor Xian of Han Dynasty.