I'm the Villainess's Sidekick

Aurora Hart transmigrates into the novel, becoming the lackey of female supporting character, Isabelle Lancaster. Isabelle offends the male and female leads, her family ruined. Aurora also doesn't meet a good end. Aurora is tasked by a system to correct Isabelle's love-obsessed behavior. She helps Isabelle take down a scumbag. She also cozies up to the Young Miss, achieving success.