Transmigrated As The Villainess' Boyfriend With A... SSS Harem System?

If the original novel has already decided that the woman I love ends up exiled, sent to the guillotine, or quietly ruined by a saccharine-sweet heroine and a golden-boy prince who's never heard the word "no"... Then I suppose I'll just have to tear the script to pieces myself. I transmigrated into my favorite web novel. The catch? I'm not the hero. I'm not even the villain. I'm the villainess's "filler boyfriend", a background character whose only narrative purpose is to die, so she can lose her mind and walk herself straight to the stake. Oh, and I only have this school year to make sure that never happens. The war for narrative control has begun. Armed with everything I know as a lit major, a tsundere princess who'd rather threaten me than admit she cares, and a power the story never saw coming—the Writer's Empero—I'm done playing a role written to die. Time to pick up the pen myself. •••••• What to expect: This story leans into every trope you know at first. Then, chapter by chapter, it pulls the rug out from under them. Think you've read every "Reincarnated as the Villainess" story and every System novel out there? Give the first two arcs a chance before you decide. And remember: there's always another secret waiting to be revealed. — Description from novelcodex.org