In the chaotic final years of the Sui dynasty, modern-day soldier Xiao Rui's soul transmigrates into Xiao Huaiyuan, the son of a powerful family in Jinyang. Thanks to the “Mist System,” which comes from an ancient jade heirloom, he turns modern knowledge into weapons for a world in turmoil: training troops, smelting steel, and reforming institutions. With a vision beyond his era, he becomes the sharpest sword in Li Shimin's arsenal.
From the Jinyang uprising to the Xuanwu Gate Incident, he helps his close friend Li Shimin lay the foundations of the Tang dynasty and usher in the golden age of Zhenguan. But when Emperor Li Yuan dies, Crown Prince Li Jiancheng and Prince of Qi Li Yuanji join forces to seize power and accuse Xiao of building up his own forces. Driven to the brink, he has no choice but to declare himself ruler of Jingguo in Yunnei City and raise the banner of reform.
Overnight, a pillar of the empire becomes its most wanted rebel, and comrades who once fought by his side become enemies on the battlefield. To the north, the Turks watch hungrily; to the south, all of Tang prepares to march against him. Meanwhile, Li Shimin, both sovereign and friend, gazes north from the walls of Chang'an, his eyes filled with an emotion too complicated to name.
On one side stand imperial traditions and rites passed down for millennia; on the other, the spark of a civilization ahead of its time. As his actions ignite a civil war on the grasslands and Tang's iron cavalry closes in on the city, he must lead the elite Xuanjia troops he forged with his own hands and fight a bloody path toward a new world on this ancient land.
This is a war that will determine the course of civilization. In a Tang empire shrouded in mist, the dynasty of the old age and the rising spark of the new are about to discover which will truly prevail.
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