17-year-old Cha Eun-Sang takes her never-do-well sister's wedding in the U.S. as a chance to escape her life as the daughter of a mute housemaid. There, she runs into mysterious Kim Tan, the young heir of a wealthy family.

Stranded by her sister and with her passport taken away by the police, Eun-Sang accepts Kim Tan's offer of staying at his house. Unfortunately, it puts her right in Rachel's line of fire, who's not happy to see another woman in Tan's home.

As Tan and Eun-Sang get to know each other better, Tan finds himself growing more attached to her. Meanwhile, Eun Sang's mother accidentally overhears her employer's mistress talking about getting rid of his second wife.

Rachel returns to Korea, and so does Eun-Sang who finds that her mother has moved into the Kim household. Missing his family and Eun-Sang, Tan decides to return to Korea as well, much to Won's dismay.

Tan causes an uproar in his house and with his social circle upon his surprising return to Korea. Tan's father, who has kept tabs on him and Eun-Sang, offers her a scholarship to Jeguk High School, a school for the elite and wealthy.

Eun-Sang and Tan begin their first day at Jeguk High School. While Eun-Sang is introduced to the social class system of the school by Chan-Young, Tan and his former best friend, Young-Do, look at each other fiercely in an empty classroom.