Oh My Villainess

After falling asleep after reading a historical smut novel, Ryan couldn't help but complain about how the 'villains', particularly one of the villainess step-sisters were treated in the story, along with the author turning the fierce male lead into a lovesick puppy. She dreams that she's the youngest step-sister, and attends the ball, and 'helps' the drugged Emperor.
Waking up after, she expects to find herself in her apartment in the 21st Century but instead finds herself in the arms of a man who seems to the Emperor. Leaving, only her ripped dress behind, she's unaware of how much she's just changed the plot as a whole.