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The protagonist Sheng Bai, a junior student in the History Department, travels to the Sui Dynasty by chance and becomes the second emperor of the Sui Dynasty, Yang Guang. He uses the historical knowledge he has learned and uses his identity as Sui Emperor Yang Guang to launch a series of grand projects in the Sui Dynasty. He understands the true history of the Sui Dynasty. Emperor Yang Guang was eager to get rid of the control of the Guanlong clan group on his rule, and launched an imperial examination system to select talents. This series of measures caused the Guanlong clan group to be dissatisfied with him. Therefore, during Yang Guang's second expedition to Goguryeo, Goguryeo was almost destroyed. News came from afar that Yang Xuangan had rebelled. Yang Guang was forced to withdraw from Goguryeo and mobilize the whole country to quell Yang Xuangan's rebellion. Yang Xuanguan's eventual rebellion represented the interests of the Guanlong gentry group. They were already dissatisfied with the rule of Emperor Yang Guang of the Sui Dynasty because Yang Guang established the imperial examination system and made the world It was fair and extremely damaged the interests of these Guanlong gentry groups, so they united to overthrow the rule of Sui Emperor Yang Guang, so that when he attacked Goguryeo, he was caught off guard by the rebellion. The demise of the Sui Dynasty fell into the hands of these Guanlong gentry groups. This is all due to the fact that Emperor Yang Guang of the Sui Dynasty in history was too impatient and eager to suppress the interests of these clan groups, which ultimately led to the death of the second generation of the Sui Dynasty. Yang Guang was probably as talented as Emperor Qin and Han Wu, because of Guan Long The gentry group, the Sui Dynasty finally died in the second generation. As a top student in the history department, Shengbai had mastered historical knowledge and understood Sui Emperor Yang Guang. After time travel, he inherited Yang Guang's rule and became "him"