Yangdi in history is a man with clear-cut gratitude and resentment.

he pays special attention to his feelings. Whoever treats him well will always be in favor of him. However, if anyone offends him, he would like to dig out his ancestors and flog them, so as to eliminate his hatred. When Yang Di was in power, he loved Yuwen's family most.

when we were fighting for Gaoli, Yu Wenshu, commander in chief of the three armies, was defeated like a mountain. 300000 elite soldiers died in Liaodong. Their heads were piled up to form a view of Beijing. If they were replaced by others, they would have been beheaded....