Obsessed by the Man-Beast and the Villain

Tiara was mysteriously transported into a world identical to the one she read from an old storybook at the restricted section in the library. She got involved in a car accident and the next thing she knows is that she woke up as Eylana. An insignificant side character in the old storybook.

Eylana wish that everything sticks to the original plot, where Rickdorian lives happily with Francisca and Chaser punished for his treason.

But what will actually happen if she was the one to meet the male lead first and not the actual female lead of the storybook? And much worst, what would happen when Eylana turned out to be the main villain's only sister?

Both the man-beast and cruel villain are completely obsessed and possesive over the side character, Eylana.