The Vicious Female Supporting Character Counterattacks and Becomes the Boss's Favorite

Good news, I wore the book and it was bound to a system. The bad news is that I have transformed into a villain in a sad novel, and the system bound to it is a new one. It will scream whenever I do bad things. So I had to do bad things and coax it at the same time. I am the sister of the hero of the novel, and I am also the villain in this novel. When the male protagonist was being beaten, I hid in a group of gangsters and made noises. When the heroine was being abused, I was there to add fuel to the fire. When everyone was working on it, I was sending knives to the screenwriter.