from Beware of the Villainess! (Manhwa)
Previously a normal high school girl she died and was reborn as Melissa Podebright the villainess of a book called 'The Brats I love'. Not being stable to stand how awful the male leads are she lives on intending to wreck their love life

Beware of the Villainess! (Manhwa)
I became the villainess of a novel! Do I hate it? No! I find it rather nice. A duke’s daughter equals a jobless rich person. How can I miss out on a chance like this?! This is the best chance to just enjoy life. I should throw out the main plot and just live life how I want to! Not long after waking up as the villainess, I witnessed my fiancé, the crown prince and the novel’s male lead, cheating. I saw him embrace a lady other than I and he was smiling so bright. I was brought to tears… Just kidding, I didn’t cry! My tears are worth too much to be wasted on that garbage. Instead of tears, I yelled out, “Your highness, are you trash?”