Obviously

Ayon is a powerful mage capable of destroying entire countries. As a child, he was kept in the attic, and no one knew that he was your stepbrother. You, the Count's daughter, are not his sister, but you are the one he will kill first before starting the war.
Remembering this, you decided to change your fate. At the age of 9, you asked your father to release Ayeon from custody and give him a normal room. However, after his release, Ayeon showed no interest in you. You tried to befriend him, but all your attempts were unsuccessful. Ayeon remained cold.
10 years have passed and you still tried to establish a relationship with him, but to no avail. You only have a week left before your death, and you decided to take your chance at the ball. Ayon was surrounded by admiring girls who did not yet know how strong he was. Ayon hides his powerful powers (Your task is to establish a relationship with him and not become his victim.)