Yu Ji was executed because Cao Cao slept soundly and could not bear to wake him up. Cao Cao is a world-famous hero and naturally has countless concubines. Among Cao Cao's many concubines, there is a very pleasing concubine, so Cao Cao often goes to the concubine's house to rest. One day, Cao Cao had something important in the army, but he was really sleepy, so he went to his concubine's room to rest and slept until noon.
Wherever Cao Cao goes, orders must be strictly observed. Cao Cao told his concubine before going to bed that he would wake himself up then. When the time came, the concubine looked at Cao Cao carefully and found that Cao Cao slept soundly. The concubines were naturally fond of Cao Cao, so they didn't have the heart to wake him up. It is because of this selfish love that concubines were killed.
When Cao Cao killed the concubines, he was actually making an example. When Cao Cao woke up, he found that the concubine didn't wake himself up. Even after listening to Yu Ji's well-founded explanation, she did not let Yu Ji go, but immediately ordered her execution. According to historical records, the choice is disorderly stick to kill people. Cao Cao's move also inspired the morale of the army and forced countless people to obey. Even those who submit to Cao Cao must seriously obey every order he gives.