While delivering a student’s dry cleaning, Geum Jan Di saves the life of a student at the most prestigious school in South Korea. Her actions soon become public and exposes the bullying within the school. To silence the public’s attention, Jan Di is offered a swimming scholarship to Shinhwa 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 accidentally spills ice cream on his shoes and he demands the girl lick it off. Jan Di defends her friend and attempts to reason with Jun Pyo’s tyrannical demand. When he refuses to relent, Jan Di turns violent, knocking Jun Pyo to the ground. Engaged by this, Gu Jun Pyo declares war on Jan Di and encourages the other students to bully her. Jan Di, however, is resistant, refusing to apologize to Gu Jun Pyo, and stands by her decision to fight him.
Ironically, Gu Jun Pyo, having never been stood up to, begins to develop feelings for her. He tries unsuccessfully to woo her as she slowly begins to spend more time with Jun Pyo and his friends. Jan Di teaches Jun Pyo that money cannot buy everything and in order to have real friends, he himself must be real or use his heart, but Gu Jun Pyo still does not understand why someone like Jan Di should dislike him. As the story progresses, Jun Pyo falls deeper in love with Jan Di and she learns how to open herself to his love as well.
As love begins to blossom, Jun Pyo’s mother discovers them and deems it unsuitable. She does everything in her power to keep the two apart, even arranging a marriage for Jun Pyo. Other factors keep arising as another member of the group falls in love with Jan Di and in a twist of fate, Jun Pyo loses his memory. In the end, however, Gu Jun Pyo and Jan Di learn that love conquers all and that they are truly soul mates.