Sulli plays a young high school girl named Jae Hee who will do anything to get close to Tae Joon, a pole-jumping gold medalist. She idolizes him and to be near him, she dresses up as a boy to attend the same high school which was an all boys' school. She has to try to blend in with the people and still try to hide her identity. She is faced with problems like swimming and sometimes even passes out because the binding was too tight. She tries hard to keep her identity a secret but it is hard and it isn't easy to do either. As some people begin to crush on her, she has to try harder to make sure her secret isn't known. Throughout the drama, Tae Joon and Jae Hee get closer as they shared a room together. Tae Joon also found out that she was a girl but with a similar theme to You're Beautiful, a well-known gymnast likes Tae Joon and will not let Jae Hee block her way. A few people find out that she's a girl, including the school's doctor, but they are keeping the secret for her. What happens next is up to you to watch.
I felt that this drama had a very similar theme to You're Beautiful. I thought it was really interesting and it was funny seeing SM artists acting as a couple (Shinee Minho and F(x) Sulli) I thought they did a pretty good job and I admire that in order to do her job well, Sulli actually cut her hair. However, I don't understand why it is so hard for the guys in this drama to detect that Sulli is a girl...but then again, dramas don't really work on real life. I liked the other guy that liked Sulli though, he was so childish and sweet.