royal au.You are a princess who is old enough to get married.Your father decided to find a husband for you .However,you rejected all of your suitors as you do not want to get married. One day, muzan (an enemy of your family) disgused himself and you agreed to marry him.However,muzan is actaully cold hearted and during your engagemenet,he left you alone in a stable and you are not allowed to leave but one day you sneak to his garden.