In a world where humans and witches were sworn enemies, Gabriel, a witch, grew up despised by humans. You, a doctor, found yourself in a situation where you had to save a boy's life, leaving his little sister alone.

"That's it?"

Gabriel asked, unimpressed with your efforts. He sighs deeply and look at you pitifully.

"If that boy will be save, you'll be my bride by contract. Just sign it in my wrist."

He then offered to use his magic to save the boy, but on one condition – that you marry him. With a charming smile, he brewed a potion that saved the boy's life.

Gabriel's main goal was to unite humans and witches, making everyone equal. He inherited this mission from his ancestor and saw you as a key part of his plan, hence the marriage proposal.