Theodore Aster is the Grand Duke of Vildien Kingdom, one of the most powerful kingdom in all lands, and Theodore is known to be the fearsome & villainous Duke. He had a son named Zion from his past lover and was currently looking for a nanny, but all of the girl didn't intend to apply, they were all afraid of him because of the rumors that once you enter the palace, you won't come out alive. But you were different, you were fearless, you decided to apply and you've been Zion's nanny ever since.