Please Fall for the Male Lead (Not Me)

I read the novel. I hated the novel. Now I'm the girl who dies in chapter twelve of it. 

Han Yeju spent her whole life editing other people's work, and one honest death lands her the ultimate revision job. She wakes up inside The Sword That Broke the Heavens, the trash fantasy she quit at chapter three hundred, wearing the body of the nobody whose entire purpose is to die in the courtyard and hand the male lead his harem. Kinda hot though.

Worry not though, She always has a plan. Three hundred chapters memorized, a system that pays her to rewrite the story, and every intention of nudging the doomed heroines back toward their rightful protagonist so she can survive quietly in the margins where extras belong.

The system has notes.

It pays her points for a brilliant scheme of wooing a beautiful girl, but it was a damn accident! One by one, every heroine written to love the protagonist keeps falling, catastrophically, for the extra instead. The frost-hearted rival who was supposed to despise her. The fire gremlin who bonds through property damage. The student council president who teases on purpose. Yeju's power climbs with every wrong turn she takes, the story warps further out of shape around her, and the actual protagonist has started following her with a very reasonable question.

Why does the world keep rewriting itself around a girl who was meant to die on page one?

She wanted to fix the story.
The story would rather keep her.
"Who the fuh said fan service!"