Princess Bom was the one and only daughter of  Emperor Park. She was about to get married to Kwon Jiyong, a son of one of the prominent figures in the empire. But Park Bom wasn't happy and she wanted to find her true love. During her birthday, that was the day before her marriage, she wished upon a wishing star, hoping that she could run away to somewhere far, just to escape her wedding. Coincidentally, another girl wished for the same thing too on her birthday! What is going to happen when they swapped places and these two girls live in two different worlds which is 200 years apart?