Goo Hye Sun as Geum Jan Di
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 Hoo on the stairway. She bumps into Ji Hoo, but later Jun Pyo shows his feeling for her and their relationship gets tangled.
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Lee Min Ho as Goo Joon Pyo
The leader of F4 and the heir of the largest conglomerate in Korea. Raised by servants, instead of busy parents, Jun Pyo’s got the world there is nothing that can’t be done. Growing up as the son of the rich family, he has gone through numerous of kidnapping, terror attempt. He is a master of martial arts and self defense skills, but avoids swimming because he experienced drowning when he was kidnapped. His older sister, Jun Hee, is the one who he afraid the most. Ironically, Jun Pyo falls in love with Jan Di, who reminds him of his sister. Jun Pyo’s got natural curly hair, hot-tempered, but has an innocent heart. Although he can fluently speak 5 languages, he shows weakness on common sense and Korean vocabulary. Jun Pyo has simple and straight personality and relies upon intuition more rather than being rationalized. He is pure at heart in front of a girl he likes, so he gets hurt when he figures out Jan Di likes Ji Hoo, his closest friend among F4.
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Kim Hyun Joong as Yoon Ji Hoo
The grandson of the formal president of Korea, Dr. Yoon Seok Young, and the most attractive guy among F4. Ji Hoo is the heir of Su Am Cultural Foundation, Art Center, and Orchestra own by his family, and also a musician. He lost his parents at age of five when he got into a car accident. He overcomes the hardness with his first love, Seo Hyeon. Ji Hoo believes that she would be his last love but he can’t get to her completely. Jan Di is the one who encouraged him when he was hesitant to get close to Seo Hyeon. With Jan Di’s support, Ji Hoo follows Seo Hyeon to France, but comes back after he realized that his feeling for her was admiration, not love. Ji Hoo does not show concern for others, knows what he wants to do, and never sweeps along with others. After Ji Hoo becomes a friend with Jan Di, his personality starts to change and conflicts between love and friendship.
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Kim Bum as So Yi Jung
The gifted potter and the successor of the prestigious family. Although Yi Jeong has gained reputation for his talent for ceramics, he cannot take away the feeling that he is living a life of his brother. Yi Jeong’s older brother, who was exceptionally talented and expected to become the heir, left home and also quit working with ceramics. Yi Jung was possessed by a sense of inferiority and this complex made him couldn’t settle down with one love. He is a playboy, but gentle and warm-hearted. Although he didn’t realize about himself yet, Yi Jeong is desperately looking for his one true love.
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Kim Joon as Song Woo Bin
The most flirtatious of the group, Song Woo Bin is the son of giant corporation in the construction industry. As the successor of a newly-promoted noble family, he is poised to face a political marriage against his will and his flirtatious nature is just a way of self-indulgence.
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Kim So Eun as Chu Ga Eul
Best friend of Jan Di, and very feminine character. Whenever Jan Di is faced with any trouble, Ga Eul will always churn out ideas like an experienced adult. Gentle-looking on the surface but is actually a girl with a strong resolute. Met with F4 because of Jan Di and even falls in love with So Yi Jung in the end.
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