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There are no students who cannot teach well, only teachers who cannot teach. This is the motto of a junior high school teacher. When a special grade teacher who teaches junior high school history traveled to the Sui Dynasty and became the teacher of Yang Yong, the eldest son of Emperor Wen of the Sui Dynasty, he discovered that being a teacher to a prince was really difficult. Not only was it difficult, it might also be life-threatening. But even so, he was duty-bound. In order to prevent the crown prince from being deposed and to enrich the country and the people and bring peace to the world, he worked hard to protect the crown prince from rebellion, protect the country from foreign enemies, expand the territory and drive out the Turks to achieve hegemony. He thought about it and walked away, hiding his merit and fame, but under certain circumstances, could he get out as he wished?