As The Lady Wishes manga summary:
In this modern twist on a fairytale romance, Hyun Eunseo was adopted by a wealthy conglomerate family at the age of seven. She was treated like a princess from childhood, but Jinha, the calm and composed youngest son of her adoptive parents, had always been particularly devoted to her. When Eunseo’s grandfather collapses, his grandsons find themselves competing to win over her heart–which is also the key to inheriting the family business empire. She knows Jinha is the best candidate to be her Prince Charming, but she struggles with a lingering attachment to her childhood friend, and Jinha’s cousin, Seungyeon. Will the wicked members of her family succeed in ruining her life and love? Or, can Eunseo realize the difference between duty and desire?