Who was Yue Fei's teacher? Was he really loyal to the Song Dynasty? Why did he kill Yang?
Yue Fei's teacher was Liu Yu. Liu Yu was a famous general and politician in the Song Dynasty. He had once served as a member of the Council of Ministers and was one of the more influential figures among the high-ranking officials in the Song Dynasty. Regarding Yue Fei's loyalty to the Song Dynasty, some scholars believed that Yue Fei was not completely loyal to the Song Dynasty, but to the country and the people. Yue Fei believed that there was corruption and injustice within the Song Dynasty and that reform was needed. At the same time, he believed that the Song Dynasty's external expansion policy would lead to internal division and threaten the country's security. Therefore, Yue Fei advocated strengthening the national defense to resist foreign invasions instead of completely relying on the Song Dynasty. As for why Yue Fei killed Yang Yao, there was no detailed record in history. However, some scholars believe that Yue Fei might have thought that Yang Yao had leaked some political and military information about the Song Dynasty to the Song Dynasty and punished him. There were also some people who thought that there were some contradictions and differences between Yang Yao and Yue Fei. Yue Fei might take this opportunity to retaliate against Yang Yao.