Han Se-kye is a top star with a secret. Once a month for a week, she turns into another person. So, despite her success in her acting career, her private life is little known to the public, and vicious rumors about her never stop. One day, she gets aboard a plane with Seo Do-jae, the CEO of an Airline company that Se-kye has been working as an ambassador. She turns into someone else in the plane, and surprisingly, Do-jae can't recognize her change. Do-jae can't remember a person's face because of the injury he got ten years ago, and he has kept the secret for all these years. Se-kye disappears again, as she always has when she changes, and Do-jae sets to find the company's ambassador. Naturally, rumors about them swirl.