Be kind to the last king and win praise.
Sima Yi is highly valued by Cao Cao, ranking above one person and below ten thousand people. However, such people were blinded by power and sought power usurpation, which failed Cao Wei's reuse. Although Sima Jia got the world by this shameless means, he was still very generous when he treated the last king. If what they have done before is not a gentleman's, then it can be said that it is the opposite. After the destruction of Shu, he was named the Duke of Happiness and gave him and his family a lot of gold and silver treasures. Sima Yan named Chen Liuwang, the last king of Wei, and he could inherit the throne. Sima Yan also treated Sun Hao, the last king of Wu. Their attitude towards the last king was sincere, which only Sima Jia had.
The breadth of mind has made many kings feel ashamed.
Many last kings in history had tragic endings, such as Li Yu being poisoned with wine. Even Li Shimin, who disliked Sima Yi, praised this behavior of Sima family. They treated the last king without affectation. Although Sima Yi used to be like this, they always treated the last king with the highest treatment. It is this kind of mind that makes all kings inferior to Sima Yi.
A person is not all shortcomings, let alone a family. Only when you know how to see the advantages of others will you grow. Know how to appreciate the advantages of others, just as all kings accept their bright spots like Sima Yi's family.