Revolves around a woman who has a chance to rise in status but falls into a bottomless pit, and eventually finds a chance to seek happiness. It also involves a man who tries to find happiness in her.
A mother's misguided love has caused her daughters to get swapped in status, and so the heroine Seo Ji-an enters the chaebol household to have a better life without knowing she is actually not their long-lost daughter, but her "former twin" sister Seo Ji-soo instead. When the secret eventually gets revealed, Seo Ji-an turns miserable and attempts suicide. Eventually, Seo Ji-an's friend rescued her and brings her back to life. What way would Seo Ji-an use to seek happiness for herself, and what will happen to her relationship with the son of chaebol family Choi Do-kyung, whom she has gotten closer to as siblings?
