A long time ago, a man came to Ha-kyung, who was struggling to pay for her mother's hospital bills. The man, who identified himself as the vice president of the Taewon Group, said he was looking for his father's benefactor. The man is looking for the maternal grandmother of a girl who lived next door to Ha-kyung when she was young, whose family had long since passed away. The man asks Ha-kyung to dress up as her woman and pretend to be her benefactor's granddaughter, and Ha-kyung, who needs her money, accepts the offer. She grew up like a benefactor's grandson and succeeded in deceiving Ha Kyung-eun's father, and everything seemed to be going smoothly. Until the man's son appeared.