The Usurper System (Matriarchal World)

She transmigrates to another world as a princess, burdened with the task of winning the throne.

She keeps a low profile and pretends to be frail, studying eight subjects by turns each night.

She receives a fiefdom and seeks to develop it, never abandoning either the battlefield or the court.

After three trials, she finally becomes emperor, and the two nations unite as one.

Bonus scene:

An envoy from Northern Qi arrives to escort the crown princess of Northern Qi to Southern Yue to marry its eldest prince. The emperor of Southern Yue orders Mu Zijing to entertain the visitors. Having had enough of the men in this women-dominated world dressing up in rouge and bright colors, Mu Zijing can't help but warm to the crown princess of Northern Qi when she sees her, just as everyone described, valiant, spirited, and imposing.

Mu Zijing: Ahhh, if this crown princess of Northern Qi were a man, she'd be exactly my type. But she's a woman. What a shame!

Crown Princess of Northern Qi: The Third Princess of Southern Yue is so delicate and soft, with such a slender waist. Could it be... that she's a man disguised as a woman, just like me?

The most delicate, frail, and seemingly sickly heroine in a women-dominated world, who hides her true nature deeply, VS the most domineering, powerful, and calculating male lead in a women-dominated world.

Theme: Self-reliance and strength, a strong people and a prosperous nation