Sima Yi
In his younger days, Sima Yi was a close friend of Hu Zhao (). In one incident, Zhou Sheng () kidnapped Sima Yi and wanted to kill him. Hu Zhao braved danger to meet Zhou Sheng in the Xiao Mountains and tried to persuade him to let Sima Yi go. When Zhou Sheng refused, Hu Zhao cried and pleaded with him. Zhou Sheng was so moved by Hu Zhao's sincerity that he released Sima Yi. As Hu Zhao never told anyone about this incident, very few people knew that Sima Yi owed him his life.