Transmigrate into a Book, the System Forces Me to Be the Villain

Sheng Le never imagined that one day she would fall into the very martial world she had yearned for. But can someone explain what it means to be bound to a villain System? Break up the male and female leads, make life difficult for the second male lead, and make men fall madly in love with you… Is that any way for a person to behave? Sheng Le wanted no part of it, but can someone explain what the protagonist's halo is? The male and female leads are practically joined at the hip. There's no way to split them up. The second male lead is so fat he doesn't even have a wife. How is she supposed to make life difficult for him? And as for the third male lead, wait, why does he like an idiot but not me? Being a villain is so hard. You have to fight monsters and level up, break up couples, and pretend to be a pure, innocent girl. System, I'm done with this… And then she gets uglier and fatter by the day…