In 'Became the Only Daughter of the Northern Grand Duke,' a captivating web novel originally written in Korean under the title '북부 대공의 외동딸이 되었다,' readers are drawn into a world where the main character questions her role as the villainous young lady. This engaging story falls under a variety of genres including action, adventure, comedy, drama, ecchi, fantasy, gender bender, harem, and yuri. With tags like academy, female protagonist, male to female, medieval, nobles, transmigration, and villainess noble girls, this novel promises a thrilling and diverse reading experience.