Jang Yoon-ha 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. She is arranged to marry a young chaebol Yoo Chang-soo. She hides her identity and works as a part-time sales woman in a supermarket and befriends with Lee Ji-yi who wants to marry a rich man and starts dreaming about it. Poor girl Lee Ji-yi has a crush on Choi Joon-ki, 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-ki catches Yoon-ha's attention and he proposes to her. Yoo Chang-soo flirts with Lee Ji-yi and they become a couple. Yoon-ha starts a relationship with Joon-ki and it goes well. Yoon-ha and her brother who is the only hope of the top management of the company, goes to Mexico in flight and she departed early. Before reaching Mexico, the flight crashes and her brother also dies. Yoon-ha's mother blames Yoon-ha for her son's death and starts crying and drinking continuously. Joon-ki secretly released Yoon-ha's photoin public without her knowledge and revealed 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-ki's house. She meets his mother and unknowingly she shows Yoon-ha's childhood photo in Joon-ki's drawer. Heartbroken Yoon-ha leaves his house angrily, she decides to join in the company for cosmetics department. Yoon-ha's sister who 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-ki 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-ki. 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-ki 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-ki proposes to Yoon-ha. Lee Ji-yi becomes pregnant with Yoo Chang-soo's child.
