It's about Junho and Hyoyeon and eunhyuk also.  Hyoyeon is a girl who is very charming and attractive but shy at the same time, but she doesn't show it off. She has been crushing on eunhyuk the junior (college) who is the best dancer in their school. Eunhyuk didn't like her because well he thought that she was unattractive until she changed her look and actually showed her charming side. Then comes junho(same grade as hyoyeon), eunhyuk's best friend who has a crush on hyoyeon but never said anything because he knew that she likes eunhyuk not him.  Taeyeon is hyoyeon's big sis.