Xiao Yan, the eldest son of the Zhenbei King of the Great Yong Dynasty, was framed by political enemies and his entire family was executed. Only he was exiled to the wilderness because of his royal bloodline. Xiao Yan, who suffered a blood feud, awakened the memory of his past life while in exile - he was actually a doctor of military history from modern times. Using modern knowledge, he gathered refugees in the miasmatic land, trained troops to farm, gathered people's hearts with "equalizing land and eliminating taxes", and trained a strong army with "three major disciplines". From being the king of a mountain to separatist power, he improved agricultural tools, promoted herbal medicine, and established an intelligence network. In troubled times, he married a holy girl from southern Xinjiang to get help from a witch doctor, and formed an alliance with the East China Sea Merchant Alliance to get support from money and food. After ten years of dormancy, he led his cavalry out of the country, destroyed the capital, and killed enemies. Finally, he established a new government on the ruins of the old dynasty, implemented imperial examinations, built water conservancy projects, and opened up sea trade, becoming the legendary founding emperor of the country.