Villainess Survival Guide

A girl transmigrates into a drama as the evil fake heiress who's destined to be tortured and killed by the heroine's obsessive brother. Bound to a system, she must raise his favorability from negative 250 to survive. Every attempt to win him over backfires spectacularly — flowers get thrown away, food offerings end with her force-fed, and system tasks that follow the original plot nearly get her killed again.