While delivering a student's dry cleaning, Geum Jan Di saves the life of a heavily bullied student,Lee Min Ha/Lee Ji Ha, at the most prestigious school in South Korea. Her actions soon became public and exposes the bullying within the school, leading the public to go against the Shinhwa empire. To silence the public's attention, Jan Di is offered a swimming scholarship to Shinhwa High School which she declines but her family forces her to attend.
During her first day at Shinhwa, Jan Di learns of the famous F4 and of the other students' adoration and fixation with the boys in the group. Gu Jun Pyo, Yoon Ji Hoo, So Yi Jung, and Song Woo Bin are the richest and most powerful kids within Shinhwa and South Korea. Subsequently, they use their power to terrorize weaker students or those they do not like. Jan Di, instead of being impressed, becomes enraged and fantasizes about confronting Gu Jun Pyo, the leader and initiator of many of the bullying acts. She gains courage to confront him when a friend, Oh Min Ji, accidentally spills ice cream on his shoes and he demands the girl to lick it off. Jan Di defends her friend and attempts to reason with Jun Pyo's tyrannical demand....