Han Se Kye is a popular actress. Though she has fame, she is infamous for being shrouded by mystery. Rumors about her life are abundant, but no one truly knows her reality. Every month, for one week, Han Se Kye's appearance changes to that of a different person. Unable to control this inconvenient phenomenon, she stays out of the spotlight when she can. Seo Do Jae is an executive at an airline company. He's extremely smart and notably handsome, but his life isn't perfect. He suffers from Prosopagnosia, the inability to recognize faces. Ashamed and afraid of how this could affect his life, Seo Do Jae keeps his Prosopagnosia a secret. To get by, he memorizes people's mannerisms and personalities. When Seo Do Jae becomes acquainted with Han Se Kye, he notices something strange: he can recognize her face. The problem is that Han Se Kye's face is ever-changing. When feelings start to develop, will they be able to ditch their secrets and concentrate on the beauty inside each of them instead?