Take Liu Bei as an example. There are different opinions about Liu Bei today. Some people say that Liu Bei is a generation of wise masters, while others say that Liu Bei is a hypocrite. Before Liu Bei achieved imperial career, Mr. Liu Bei followed Ada, Gongsun Zan and Tao Qian, and Tao Qian gave Liu Bei a pair of men. He took refuge in Tao Qian, but just after taking refuge, Tao Qian died, and his two sons died one after another. After that, Liu Bei took refuge in Lu Bu's door. Lu Bu didn't believe Liu Bei after all. In this case, Liu Bei followed Cao Cao and destroyed Lu Bu! ?
Later Liu Bei came to Beijing and followed Cao Cao. He planned to kill Cao Cao again. Finally, after failing to rebel against Cao Cao in Xuzhou, he went to Yuan Shao, but seeing that Yuan Shao didn't do much, he went to Liu Biao again. After Liu Biao died, one son surrendered to Cao Cao and the other son followed Liu Bei.
When Zhou Yu defeated Coss and got Jingzhou, Liu Bei had the cheek to ask Zhou Yu for sovereignty to come to Jingzhou, but the loan was never repaid, and he simply regarded Jingzhou as his own territory until he broke with Zhou Yu!