I’M The Heroine summary:

I became a successful career woman at a young age, I was supposed to lead a life without hardships. But instead I got trapped in a novel as the heroine Gabriella Lylith. I was determined to live my life as it’s supposed to be in the story so I would return to my original world. But my plan failed when the villainess of the story, Marianna Rosally, who was supposed to die, got a second chance to change her fate, return from the dead and turn back time. You messed with my neatly arranged life. I will send you back to your grave and return to my world!