Jessica Jung / Jung Soo Yeon (20) ~ SM High's Ice Princess, close to Taeyeon and Tiffany. Seems like an ice cold person due to her looks and personality but is actually warm to those that are close to her. Has a younger sister named Krystal. Class 3/1

Im Yoona (19) ~ The Most Popular Girl in SM High and is known beautiful inside out. She is Seohyun's cousin and would do anything to protect her. Best friends with Soo Young and Yuri. Class 2/3

Kim Taeyeon (20) ~ Winner of SM High's Best Singer Competition. Tiffany's girlfriend, best friends with Jessica. Vice Student President of SM High. Oldest among Jessica, Tiffany and her. Class 3/1

Tiffany Hwang (20) ~ Her eye smile melts the hearts of all and has a long line of both guys and girls chasing after her. Taeyeon's girlfriend. Student President of SM High. Class 3/1

Seo Juhyun (19) ~ Known for being a nice sunbae and is scarier than Hell Sica when rages but thankly it happens almost once every blue moon. Cousin of Yoona. Close friends with Yuri, Soo Young. Class 2/3

Krystal Jung / Jung Soo Jung (18) ~ Jessica's younger sister. Loves to sister alot. Well known for beating Yoona in an online poll for the most girl and came in first then yoona then her sister. She is currently holding the title 'Most Beautiful Girl' in SM High. Best friends with Seulgi and has a crush on her. Class 1/2

Other Characters

Sunny (20) ~ Good friends with Hyoyeon. Likes to insult Hyoyeon for her short height despite her being taller by only 1cm. Class 3/2

Kwon Yuri (20) ~ Close with Yoona, Seohyun and Soo Young. She is well known for being a beautiful prankster among SM High and a high reputation. Class 3/3

Choi Soo Young (19) ~ Close with Yoona, Seohyun and Yuri . Class 2/3

Kim Hyoyeon (20) ~ Good friends with Sunny. Well known for being the Dance Club's President. Has the best dancing skills which is followed by the Vice President, Seulgi. Class 3/2

Kang Seulgi (18) ~ Has the second best dancing skills in SM High. Vice President of the Dance Club. Best friends with Krystal. Class 1/2