Im Yoona, a simple girl living in the United States with her Aunt ,she lived happliy during the time she spent there,but one day her mom calls and told her to go to Seoul so that her mom can take care of her. She left her life,friends and her Aunt. She decided to have a new start but many questions popped in her mind. Who's her mom? Why did her mom decided to take her ack after many years?