The female protagonist was reincarnated as an ignorant girl trapped in the palace. Later, she became a ruthless swordsman who wielded her sword. Fate seemed to have played a joke on her. The male protagonist was disabled but would recover later. He was a white man who had turned black, and he had a crush on the female protagonist for a long time. He was extremely possessive from the beginning to the end. There was no male and female supporting characters who could shake the protagonist's emotional line. The ending was perfect. It was similar to the plot of the novel mentioned in the question. I hope you like this fairy's recommendation. Muah ~😗