She originally lived a peaceful life, but suddenly she met a demonic prince. In order to pay off her bankrupt father's debts, she had no choice but to work as a nanny at his house. Now it's better, he has been teasing her since the first day she came in. He who doesn't like to laugh suddenly loves to laugh. Gradually, the two fell in love with each other, but what awaited them was not the fairy tale of the prince and Cinderella entering the castle...