The drama features Jiyoung as the lead character Aoyama Sara who is a 27-year-old single mother with a 6-year-old daughter. Her mother-in-law turns up suddenly to snatch away her daughter as Sara is crumbling from the stress and fatigue of working day and night to make ends meet and fails to notice that her daughter is sick. One day, Sara happens to witness a woman named Shiina Maoko (also played by Jiyoung), a police detective who looks exactly like her, jump onto the railway tracks in front of her so as to commit suicide. When Sara comes to know about Maoko's rich background after picking up the latter's bag, she decides to impersonate Maoko so as to lay hands on her fortune and be able to live with her daughter in future. However, Sara starts to come across various women from different backgrounds who look exactly like her for some strange reason and the people around Maoko notice something strange with Sara and start to suspect her.