Taecyeon plays Jin Gook, a problematic child who puts up a wall between himself and the school. However, he gets recruited by the chairman of Girin Arts High School who had noticed his talents in becoming a world star.
Suzy plays Go Hye Mi, a rich and beautiful arts student who dreams of becoming the next Jo Su Mi (a famed female soprano). She is also the love interest of Jin Guk.
Kim Soo Hyun plays a young man named Song Sam Dong who dreams to have his own farm since he was a child. But, because of his crush on the female lead, he follows her to the arts high school. Here, he discovers his hidden talent in music and starts his path to becoming a star
Wooyoung plays Jason, an aspiring dancer from a foreign country. His superior dance skills allows him to be accepted by the Girin Arts High School.
Ham Eun Jung plays the role of Yoon Baek Hee is a student that confidently passes the audition for the Girin Arts High School and transforms from an ugly duckling into a beautiful swan. She will later become the biggest rival of Go Hye Mi.