Kim Minji was never one to let others worry about her. She'd rather let everyone not know what was going on around her and keep it in. Her brother was rarely around because he was a trainee at Big Hit entertainment. Now, he is part of popular rookie group Bangtan Boys (BTS). The boys are on haitus for a few months meaning, they have to go back to school. 

Park Jaemin was a happy girl with a dark secret. She was abused at home and at school. She always wore a sweater to hide her scars. She would wear a sweater never allowing anyone to see her legs, back or arms. She has always wanted to be a singer/songwriter and she has composed many songs going by the name KuroiYuki.

Lee Suki, the school nerd, was openly bullied at school. Being falsely accused, she was now a main target for other students laughter and amusement. She was alone for most of her life because her parent's were always working. She didn't have anyone to hold onto for hope or anything but she was always kept going. 

Jung Jihyun was infamous around the school for being sisters to one of the kingkas Daehyun of BAP. Although she was well known, she has a rebellious attitude towards the school queenkas. Because she is Daehyuns sister, the queenkas can't do anything to her since the bap member would find out.