Koo Ha Na is a single woman. She grew up as the eldest child in her family and became the family's breadwinner, while developing a strong sense of responsibility. She is devoted to her family, but she learns the shocking truth that she is not her family's real daughter. Her family were the enemies of her real parents and she has been used by her fake parents. Koo Ha Na is now reborn and becomes the incarnation of revenge. Meanwhile, Hwang Jin Gu is the CEO of Hyesung Tour, which is a subsidiary of the Hyesung Group. As the CEO, he has earned the full confidence of his people after guiding his company to the second highest spot in the industry. He becomes involved with Koo Ha Na. At first, he doesn't have a good impression of her, but he gradually begins to feel compassion for her.