This is from the "otome game but I am the villainess" genre, however, it's told from the crown prince's perspective. It's quite refreshing, also he's lowkey highkey a sadist. The villainess is absolutely adorable and you can't help but fall in love with her, especially since the story's told through her lover's perspective. Because she loves the crown prince so much, she resigns herself to the role of the villainess and decides to be the best villainess ever!!
The evil-heroine-being-also-reincarnated is executed very well. Even though she might not have been a bad guy for expecting things to play out in the way she knew it will (even when it doesn't), she really did descend into the crazy beautifully.
Jishou Akuyaku Reijou na Konyakusha no Kansatsu Kiroku