A rationalizing Cinderella story between Gil Ra-im (Ha Ji-Won) a stuntwoman and Kim Joo-won (Hyun Bin) a high-end department store CEO (a modern-day prince charming). Through a misunderstanding while trying to resolve a scandal of his cousin, Oska, a famous singer, Ra-im and Joo-won meet and he finds himself stunned by her coolness. Joo-won, who has sound judgement and does not believe in 'love at the first sight' does quite not understand why he has stuck on her, as her appearance keeps coming to his mind. Then as he pursues her she starts reciprocating his feelings, even though Gil Ra-im is seen as a poor and has a profession that has an invisible existence. However, she has a lot of passion to progress in her career and has a been self-supporting that makes her not believe in fairytales. As two different worlds collide, the development of learning about each other happens. For example, 'Cinderella' has learned about a dress code and 'the prince charming' has learned about the little mermaid's right! Oska is a playboy who wants to lead a hedonistic life and resume his popular status as a hallyu star. Then he reunites with his former love Yoon Seul, who has made a successful directing career for herself. But Yoon Seul wants nothing to do with Oska, rather she has her eyes set on Joo-won. The four become tangled in a love square, that becomes more confusing when Ra-im and Joo-won begin switching bodies.