Han Se Kye (Seo Hyun Jin) is a top actress with many rumors surrounding her, especially because she seems to disappear out of the blue sometimes. To others, her life is a mystery because she's hiding an unbelievable secret. Her appearance completely changes for one week every month! One minute, she's the most famous actress in Korea, and another minute she can become a middle-aged businessman! One day, she encounters Seo Do Jae (Lee Min Ki), a brilliant man who is an executive at an airline company. He seems to have it all: a perfect appearance, intelligence, and a good job; but he has a secret too. He suffers from Prosopagnosia, the inability to recognize faces. However, he manages to hide this from the world, and he makes an effort to remember people by their personalities instead. Seo Do Jae (Lee Min Ki)'s life begins to change when he meets Han Se Kye (Seo Hyun Jin). She is the only person whose face he can recognize. But with Han Se Kye (Seo Hyun Jin)'s constant disappearance and random physical changes, how long can she keep her secret?