I Became the Wife of the Male Lead summary:
Evil mage Fiona Green was destined to die at the hands of the protagonist couple in "The Emperor and the Saint." That is, until the story’s author became Fiona herself! Though mistreated, cast out by her pompous family and thrown into the battle at Heylon, Fiona is determined to use her magic for good. But things take a rather unexpected turn when she rescues the male lead, Siegren, turning him from foe to friend...Will she successfully rewrite her fate without changing the story’s happy ending?