Military Service: From Impostor to Ruler of the World

[Alternate history, transmigration, no System] The nine provinces have been united for ages, then divided; divided for ages, then united.

The imperial court is in turmoil, the people are destitute, and famine ravages the land.

Families trade their children for food, while the wealthy feast and dance.

Bandits run rampant, raising banners and claiming power as the nine provinces fracture into warring territories...

Until the heaven-chosen one appears, reunites the nine provinces, strikes back against the barbarians, and rules the world!