[Dark, ruthless villainous loyal-dog male lead VS bold, free-spirited, black-bellied Grand Princess]
In her previous life, Xia Hanyu trusted the wrong people and was used, leading to the fall of her kingdom. Unable to accept it, she leapt to her death for her country. In the blink of an eye, she was reborn before the kingdom's fall and forcibly bound to a Powerful Nation System.
The kingdom still stands, and its loyal ministers and valiant generals are still alive. Xia Hanyu is "forced" to save them all, and gets rewards for every rescue.
When enemy forces invade the frontier and the army runs short on provisions, Xia Hanyu produces potatoes, boosting the troops' morale.
When floods devastate Runan and drought ravages Shu, Xia Hanyu produces sweet potatoes, saving the people from famine.
When a snow disaster strikes Jinling and the people despair, Xia Hanyu produces cotton, keeping everyone warm.
The Emperor: "Ayu truly lives up to her title as the Grand Princess who safeguards Great Xia..."
The ministers: "We pledge our lives to Your Highness, the Grand Princess..."
The people: "May Your Highness, the Grand Princess, enjoy a long and peaceful life..."
By the time the conspirators realize what is happening, all of Great Xia has become an impregnable fortress!
Powerful Nation System: I did my work in secret and take no credit.
