Education: Kirin Arts High Background: He was a child actor Played by: Jinwoon The main character. Through out the whole drama, Yoo Jin's dream is to become a true rocker. He starts off disliking idols because they are fake but his feelings begin to change once he meets JB. His dream is to make true music and he has a crush on Hyesung. In the middle of the drama, he starts becoming friendly with Rian and they eventually become good friends, even to the point where they are mistaken as a couple. In the future, he becomes a teacher at Kirin High and at night, he's a rocker.
Jinwoon is part of the Korean-pop group 2AM. He is under the same music company as JB and JR.
Rian
Group: HershE, Super Idol Played by: Jiyeon A selfish, cold heart singer who wants to survive in the entertainment industry. Her personality is always the cause of misunderstandings between her peers. She dated JB during their trainee days but later broke up because of JB's promise to his father. As she enters Kirin Arts High School, she becomes friends with Yoo Jin and they help each other through situations. Initially hating Hyesung, she later ends of befriending her. In the future, she becomes a multi-talented artist who sings and acts.
Jiyeon is a member of Korean girl group T-ara. Her group member Eun-jung acted in the first season of Dream High.
JB
Group: Eden Played by: JB He first starts out as an egoistic person who only cares about becoming the top star. Due to a promise he made with his deceased father, he broke up with Rian to reach his goal. After entering Kirin Arts High School, he meets Hyesung, who influences him to rethink his goals. He eventually ends up falling for her and helps her achieve her goals even at the cost of his future. JB has a love-hate relationship with Yoo Jin. They first start out hating each other and as they compete, he starts forming a brother relationship with him as the series progresses. In the future, he becomes a producer.
In reality, JB is part of the boy group, JJ Project, along with Jr, that the company debuted on the 22nd of May. He is label-mates with Jinwoon (a.k.a Yoo Jin)
Shin Hyesung
Education: Kirin Arts High School, Berklee School of Music Played by: Kang So Ra She starts of being a huge fan of JB. As the story progresses, she ends up dating him however, she eventually breaks up with him and they remain good friends. At the beginning of the story, she has low confidence and she does not know what to do however, at the end, she finds her true path, a script writer. She becomes a script writer and a director in the future. As well, she and Rian become best friends in the end despite fighting over JB.
Jr.
Education: Kirin Arts High School Played by: Jr He is first introduced as a backup dancer for Eden. Jr is Yoo Jin's best friend and also one of the best dancers at Kirin High. Initially, he dislikes JB for his egoistic attitude however, they eventually become friends. Later on in the story, he falls for the Seul and the last episode shows them as a couple. In the future, he becomes a dance instructor at Kirin High and he is dating Seul.
Jr, along with JB, is part of the Korean boy group called JJ Project. Their debut single is called "Bounce". In JJ Project,
Nana
Group: HershE, Super Idol Played by: Hyorin She is involved in a love triangle between Siwoo and Hong Joo. As the story progresses, she gets diagnosed with vocal nodules and she has to stop singing for a period of time. In the future, she is still shown with Siwoo and Hong Joo, who are trying to win over he.
Hyorin is part of the Korean girl group SISTAR. She is the main vocal of that group.
Ailee
Group: HershE, Super Idol Played by: Ailee She is the third member of HershE. Although she does not get paired with anyone, she acts as support for both Nana and Rian. In the future, she is a singer and her producer is JB.
Ailee is a solo singer who debuted in 2012 with her song "Heaven".
Si Woo
Group: Eden Played by: Park Seo Joon He is known as the rebellious playboy of the group. In the drama, he has a crush on Nana. He was nearly expelled by the president however, he was able to continue on at Kirin High.
Lee Seul
Education: Kirin Arts High School Family: President Played by: Jung Yeon Joo A rebellious girl who has a bad relationship with her father, the president. After transferring into Kirin High, she meets Yoo Jin and his friends and she joins their group. In the middle of the series, she starts falling for Jr. In the future, she is the principal of Kirin High and she is dating Jr.
Yang Jin Man
Role: English Teacher Played by: JYP Jin Man is the only character that was brought back from Dream High 1. He is an English teacher and his dream is to become an idol.
JYP is the founder and CEO of JYP Entertainment. The company houses artists like JJ Project and 2AM.
Principal Joo
Role: Principal, teacher Played by: Kwon Hae Hyo At the beginning of the show, he starts off as the principal of Kirin High. As President Lee takes over the school, he temporarily quits however, he comes back as a teacher of Kirin High. In the past, he was a rocker before he became the school principal. He is Yoo Jin's role model. He is also the owner of a chicken restaurant.
President Lee
Role: President Family: Lee Seul Played by: Kim Jung Tae At the beginning of the show, he is depicted as a mean person and he has a bad relationship with his daughter. By the end of the series, he is a warm and kind person and his relationship with Seul was fixed.
Hyun Ji Soo
Role: Teacher at Kirin High School, left hand person of the president Played by: Kahi Ji Soo acts as the idols' manager. At Kirin High, she a teacher.
Kahi is part of the Korean girl group Afterschool. She will be leaving the group in September and start out as a solo artist.