My older sister is a villainous rich girl.

"You're a villain," Wayne said, pointing to a girl elegantly eating a cookie. The girl nodded in agreement, making "mmm" sounds with delight. "You're a villain too," he said, moving his finger to a small white dog licking the rim of a cup on the table. The dog looked up at him and barked twice. Wayne's expression suddenly changed: "What! I'm a villain too!?" (This book is also known as: "Holding a Villain's Script but Falling into a Romantic Comedy with the Protagonist—Is This a Mistake?")