Shen Lu, a doctor of history, accidentally traveled through time and found that he was bound to a "National Destiny Repair System" - every time he visited a historical time and space that was on the verge of destruction, he would become the most inconspicuous person of that era: a soldier in the frontier army who was used as cannon fodder, the last emperor who was ignored, and the down-and-out prince who was falsely accused...
The system only gives one rule: repair the fate of the country in this world, otherwise the soul will be trapped in the gap between time and space forever.
The way to fix it? Casual.
So——
When he was a pawn, he used modern military knowledge to build an iron army and beat the barbarians until they called him daddy;
When he was a coward, he used the emperor's mental skills to backhand all the powerful officials in the dynasty, and transformed from a puppet into a real dragon;
When he was the crown prince, he used a mouth and a belly of conspiracy to make those who framed him kneel and sing conquest.
Every time a time and space is restored, the system rewards a heaven-defying ability that can be brought into the next world.
Shen Lu discovered that he was becoming... The ultimate emperor spanning countless eras.
