Cao Cao attacked Xuzhou, and Liu Beijun fled in defeat. Guan Yu was separated from Liu Bei and Zhang Fei and was trapped in a dirt mountain. Zhang Liao, the general of Cao Cao, had a good friendship with Guan Yu, so he went to surrender, and Guan Yu agreed with Cao Cao on three things. Cao Cao promised that Guan Yu surrendered; Otherwise, I would rather die than surrender.
On the one hand, my uncle and I swore to help the Han family. Today, we only surrendered to Emperor Xian of Han Dynasty, not to Cao Cao. In both cases, the second sister-in-law should please support her uncle's salary, and everyone is not allowed to come to the door; Of the three, knowing Liu Huangshu's whereabouts, no matter how far away Wan Li is, it is easy to resign.
The first condition is that Cao Cao was the prime minister of the Eastern Han Dynasty at that time, and he could nominally represent the Eastern Han court. Therefore, Guan Yu's so-called "lowering the Han Dynasty without lowering Cao" means nothing. As for whether Guan Yu admits or not, Cao Cao can naturally agree to this condition that is not a condition.
The second condition, since Cao Cao wanted to woo Guan Yu for his own use, naturally he would not mistreat Guan Yu's sister-in-law, so Cao Cao also readily accepted this condition.
But Guan Yu's third condition was unacceptable to Cao Cao. If Guan Yu got the news of Liu Bei and left, wouldn't it be a waste of time to win him over? But under the persuasion of Zhang Liao, Cao Cao finally agreed to Guan Yu's three conditions.