Aika lives with her three best friends: Irina, Cee and Annie. They live together in a house close to their school. Aika, Irina, Cee and Annie are all Seniors. 

Aika - Main Character of the story. Childhood friends with Choi Seunghyun aka TOP of Big Bang and Irina. Quiet, timid, yet very hyper when around her closest friends. Is loyal with people she loves and extremely lazy when it comes to waking up in the morning. Enemies with Cheondoong (classmate). 

Irina - Aika's childhood friend. Doesn't like TOP much, actually, doesn't like anyone much at all. Except for her friends and her boyfriend, Jung Byunghee (G.O). Has had an interesting past before she met Aika, Annie, and Cee. 

Cee - Real name is Charles. Hat loving, money spending kid of the group. Doesn't like it when Irina threatens to ruin his hats yet he still annoys her. The level-headed (somewhat) one out of the four. Has a crush on Seohyun (classmate). 

Annie - Oldest of the four yet acts the youngest (and appears the youngest as well). Boyfriend is Cheolyong, known as Mir (classmate). Loves her three friends dearly and is extremely protective over them all, especially Irina (because she gets into trouble a lot). 

MBLAQ and Big Bang do appear in this, but Big Bang are the ones that are famous while MBLAQ members are students.