Yun Ge Fei, an illegitimate son of the Yun Ge clan, is actually the reborn soul of a history teacher from Earth.
Returning to the capital from another city, Yun Ge Fei is targeted for assassination. Only then does he learn that the legitimate sons of the Yun Ge clan have all been killed by their rival family. But he is not the eldest illegitimate son, so why has he become the clan's heir?
A closer investigation reveals that something is amiss, uncovering the hidden currents that have churned beneath the clan and the empire for centuries. Demons run rampant, and all manner of monsters emerge.
To escape the entanglements of various factions, Yun Ge Fei retreats to the mountains, where he masters peerless martial arts.
By the time he returns to the world, both his country and his family are on the brink of collapse.
To save his country from peril and its people from suffering, Yun Ge Fei draws on his knowledge of history to build an army, improve weapons, and adapt successful battle tactics from Earth's past. He brings the art of ancient warfare to its utmost heights and ultimately becomes a great ruler of his age.
Only after unifying the realm does Yun Ge Fei discover that the true threat of the empire's extinction comes from mysterious, terrifying beasts stirring in the vast snowy mountains...
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