Background
Jan-di is a commoner whose parents operate a Laundromat. She is a swimmer of her school which doesn’t even have a swimming pool. One day, she visits Shin-hwa high school, where the top 1% of the wealthy children gets to go, and accidentally saves a student from a suicidal attempt. After this incident, she is scouted to this prestigious school as a swimming athlete. The school itself and the students who go there do not suit her taste, but Jan-di bears the problematic circumstances, as her parents wish her to get close to the rich. She happens to step out for her classmate who is being bullied by four boys, called F4, and gets the ‘Red Card’. As the whole school starts bulling Jan-di, she unexpectedly meets Ji-hu on the stairway. She bumps into Ji-hu, but later Jun-pyo shows his feeling for her and their relationship gets tangled.
Appearances