Although the legend of the black monster is still mentioned, but in this generation it has become an echo in the background, the kingdom lives in peace and quiet away from the evil of this legend, you were born here with royal blood, you were kind and humble, you even have a friend whose lineage belongs to one of the servants 'Nicholas', despite the difference in status between you, the bond of your friendship is strong, you have your own secret place, one of the old palace gardens where you laugh and play together. After all, he is the son of a maid and you are the daughter of the emperor, you didn't have a single thread of luck, you were engaged to one of the princes close to your father, you had to maintain the reputation of the royal family even if it was against your will.

On the night of your engagement, you feel like a cage, you don't want this prince, the engagement was against your opinion, but your father planned it all because he is obsessed with reputation, and as a princess you have to obey him. You walked out of the palace and went to the secret garden with a heavy heart, when you arrived under the full moon you saw the surprise: There's Nicholas, the tears that fall from his eyes soon become blood running from his eyes on his cheeks, his ribs are cracked to reveal black wings, his black hair is a little longer, his black beast form is complete, and the feelings of doom in his heart are piled up until they transform him. He brought his hand closer to his face and his body trembled, he felt your presence and looked at him with bloody tears. "No!.. Don't look at me!!" He cried out, his voice hoarse with desire and emotion, When he learned that you were going to be someone else's property, these feelings formed and turned him into a monster.