[Historical what-if + Ming dynasty + soul transmigration + cathartic power fantasy + ruthless decisiveness + subverting expectations]
Hongwu Emperor Zhu Yuanzhang transmigrates into Chongzhen and inherits the Ming dynasty at its worst.
A bowl of sour soup from the start, while the entire court is still wailing about how poor they are and squabbling over factional politics?
Old Zhu grins. "Just what I wanted!"
If you love lining your pockets, then we'll set up a giant pot and make an example of you. The execution grounds will be full of "role models"!
Once the corrupt officials are dealt with, he'll take on the Shanxi merchants, confiscate their estates, wipe out their clans, and send every last ounce of gold and silver into the treasury!
The Jurchen raiders are attacking the passes from outside, while rebel bands are running rampant within?
Old Zhu produces an arsenal of weapons centuries ahead of their time, points at the island beyond the East China Sea, and says coldly:
"Make it disappear."
The Son of Heaven of the Great Ming speaks, and it is done!
The course of history? He crushed that thing underfoot long ago!
From now on, he is the law of the Great Ming, and he is the heavens above it!