A melodrama about people who live wearing 'masks' to hide their true identities. Byun Ji Sook (Soo Ae) has always had a hard life with her father constantly going into debt and being chased by loan sharks. She desperately wants to know what life is like if she was born into a better family and didn't have to worry about money all the time. When a series of circumstances brings Ji Sook to Eun Ha (Soo Ae), a woman from a wealthy family who strongly resembles Ji Sook, she grabs hold of the chance for a better life and assumes Eun Ha's identity and begins to live her elite life. She meets Min Woo (Joo Ji Hoon), a chaebol heir who is mistrusting of the people around him. But when he realizes that Ji Sook is not like the other women he has met, he is drawn to her. How long can Ji Sook keep up the charade and hide her true identity?