I’m Not the Villain’s White Moonlight!

Belle opens her eyes to find herself a noble within a romance novel on a mission to seduce the main character – Duke Arges, known as “The Beast” – to change the course of the story, Adhering to the principle of “staying away from the main character” and hating the behavior of the nobles, Bell draws the attention of Duke Agnes, will Bell be able to carry out this task?
I’m Not the Villain’s White Moonlight!
What Caused This to Happen..?!