The series centers on Goo Joo Hee, a Korean girl who lives in the United States. One day, she sees a track and field competition on TV, and becomes attracted to one of the high jump competitors, Kang Tae Joon. She begins to idolize the young athlete and eventually transfers to Korea to attend the same school that Tae Joon attends after he suffers an accident that could potentially end his career. There is a catch, however: Tae Joon attends an all-boys high school and Jae Hee must disguise herself as a boy to enter.

Jang-il, the smartest of the school, and Seon-wu, the strongest kid in Yeosu, are best friends. Influenced by Jang-il, Seon-wu starts studying and working hard towards his dream. However, all of a sudden, Seon-wu’s guardian, Kyung-pil, dies a mysterious death and Seon-wu becomes blind while investigating on the case. Su-mi witnesses the scene that Jang-il attacks Seon-wu but remains silent on it and waits for the right moment. Ji-won, who is a volunteer reader for visually impaired people, meets Seon-wu by chance and they fall in love. Despite his strong feelings for Ji-won, however, Seon-wu breaks up with Ji-won so she can have a better life. 13 years have passed. Jang-il becomes a special prosecutor. Seon-wu becomes a young CEO of Royal Tree, an investment trust company. Ji-won works as a VIP party planner at a five-star hotel. And Sumi becomes a hyperrealism painter. They all have gone their separate ways. However, the fate draws them back together…