Jang Yoon-ha (Uee) is the youngest daughter of a chaebol family. Her family is a mess. Hated by her mother, she wants to live a normal life like a normal person. Her parents arrange for her to marry a young chaebol Yoo Chang-soo (Park Hyung-sik). She hides her identity and works as a part-time sales woman in a supermarket and befriends with Lee Ji-yi (Lim Ji-yeon) who wants to marry a rich man and starts dreaming about it. Lee Ji-yi has a crush on Choi Joon-gi (Sung Joon), a brilliant and hard-working friend of Yoo Chang-soo, who comes from a poor family and wants to become rich by marrying a rich girl. Joon-gi catches Yoon-ha's attention. Joon-gi confesses his feelings to Yoon-ha and asks her to become his girlfriend. Yoon-ha starts a relationship with Joon-gi and it goes well. Meanwhile, Yoo Chang-soo flirts with Lee Ji-yi and they become a couple. Yoon-ha and her brother, who is the only hope of the top management of the company, plan to take a trip to Mexico. Yoon-ha gets off the flight early, with her brother's blessing, in order to spend more time with her new boyfriend, Joon-gi. After reaching Mexico, Yoon-ha's brother boards a yacht which crashes and is destroyed against a reef. He is presumed dead, even though his body is not found. Yoon-ha's mother blames Yoon-ha for her son's death and starts crying and drinking continuously. Joon-gi secretly released Yoon-ha's photo in public without her knowledge and reveals that she is an heiress. Yoon-ha becomes a celebrity. Yoon-ha's brother transferred all of his shares to Yoon-ha. One day, Yoon-ha visits Joon-gi's house. She meets his mother and unknowingly she shows Yoon-ha's childhood photo in Joon-gi's drawer. Heartbroken Yoon-ha leaves his house angrily, she decides to join in the company for cosmetics department. Yoon-ha's sister would do anything to have control over the company. On the other hand, Yoo Chang-soo and Lee Ji-yi relationship is shaken by Chang-soo's mother. She wants to break their relationship and to marry Yoon-ha. Choi Joon-gi realises his love for Yoon-ha and wants to reconcile with her. Yoon-ha uses her popularity to make a huge profit in the cosmetics department and becomes a higher authority in the company. Later, Yoon-ha unites with Joon-gi. Yoon-ha discovers her brother's secret documents filed against her sister about cosmetics ingredients trades in the company. At last it is revealed that Yoon-ha's brother is alive and he comes back to the company. Choi Joon-gi quits his job. Yoo Chang-soo becomes stressed and drinks continuously which makes his mother unite him with Lee Ji-yi. Finally, Yoon-ha's sister is thrown out of the company. Joon-gi proposes to Yoon-ha. Lee Ji-yi becomes pregnant with Yoo Chang-soo's child.
