Fang Chen transmigrates to the fourth year of Jianwen and awakens a Family System. As long as someone is related to the Fang family by blood, he can possess them at any time.
He thinks this ability will let him do as he pleases in the Ming Dynasty, but then discovers he has possessed Fang Xiaoru, on the very day he is to be put to death.
A disastrous start! Fang Xiaoru is the only person in history whose entire clan, through ten degrees of kinship, was exterminated.
Fang Chen: "Kill me! There are thousands upon thousands more of me!" (Literally, thousands upon thousands of me.)
To forge a bond with the imperial family [with royal blood, he can naturally take the empire from the Zhu family], Fang Chen goes to great lengths to marry his descendants into the imperial household and produce royal heirs.
A hundred years later, Fang Chen takes control of the reigning emperor and launches a massive building campaign.
The Single Whip Tax Reform? Change it!
The land tax reform? Change it!
The military farming system? Scrap it! Replace it with a recruitment system!
Conquer the Mongols, sail west, colonize Japan, establish a governor's office in the South Seas...
Reform after reform follows. With countless people to possess, Fang Chen acts with utter impunity. He has no fear of death, because if one body dies, countless others remain for him to possess!
From then on, the Ming Dynasty enters an entirely different golden age...