The Marquess's Daughter Plays the Perfect Pawn is a Manga/Manhwa/Manhua in (English/Raw) language, Webtoon series, english chapters have been translated and you can read them here. You are reading The Marquess's Daughter Plays the Perfect Pawn chapters on ManhwaZ, fastest updating comic site. The Summary is
The daughter of a marquess, Julianna is known as the "perfect lady" by society. However, she has a secret. She's only enjoying acting like the perfect lady! Her true self is hidden under an invisible mask. One day, she is summoned by Prince Edward, the "perfect prince" who is actually a black-hearted schemer! At the royal palace, he gives her a fiendish order. "Become my pawn. You don't have the right to say no!"