Seon U comes from a poor family background. She was once a promising Taekwondo athlete, but she now works part-time jobs to support herself. One day, she is selected to become the stand-in for Ji Yeon due to their similar appearance. Ji Yeon is the granddaughter of Beomhan Construction Company's chairman. She was the driver of a fatal hit-and-run car accident. Seon U must play Ji Yeon in front of the public and media. Meanwhile, Seon U becomes the target of Ho Jung's hostility. Ho Jung is Ji Yeon's stepbrother, and he has an inferiority complex over Ji Yeon. He wants to become the successor to Beomhan Construction Company.