Liu Xiu asked Han Guangwu to resurrect Wang Mang, the consort of the late Western Han Dynasty, and usurped power, which caused great chaos in the world. As a civilian, Liu Xiu, who has the royal blood of the former dynasty, took advantage of this situation to fight in his hometown. Liu Xiu openly broke with the Reform regime and proclaimed himself emperor in Hebei, with the title of "Han", which was called "Hou Han" or "Eastern Han" in history. After more than ten years of unification war, Liu Xiu has eliminated many separatist forces, such as turning over a new leaf, Chimei, Kanto, Gansu and Shu, and reunified the torn and war-torn land of China since the last years of Xin Mang.

Imperial College in Han Dynasty is an ancient university in China. Emperor Wu of the Han Dynasty founded imperial academy five years ago, which was the highest institution of learning in China at that time. Imperial academy appointed a professor with excellent academic performance and high moral character as a doctor. Recruit students, learn from professors, and call them doctoral disciples. Imperial academy's courses are mainly applied classics, and students are classified. After passing the examination, they are appointed as government officials. Imperial academy used Confucian classics such as poetry, calligraphy, ceremony, the Book of Changes and the Spring and Autumn Period as teaching materials.