Melin's Salvation Plan

I suddenly woke up in the body of Melinia, a supporting character and the first love of Male Lead A from "Azuli's Magnificent Misfortune." Since I know how this tragic tale ends, I decided to do what I can to stop the ultimate destruction of the kingdom from the male leads. But the more I try to fix things, I can't help but notice that the storyline seems to veer farther away from what I read. Will this plan of mine work? Or will it just cause more harm than the original?