i woke up as the villainess

You binge-read a manhwa about Seraphina, the rich mean girl who bullies the heroine and gets executed in chapter 40. Then you woke up inside her body, in her gold dress, on her first day back at the Imperial Academy. You know every plot beat, every death flag, every line that gets her killed. All you have to do is not say them. Easy. Except the male lead just sat down beside you, and that is not in the script.