Jinyoung,CNU,Eunjung n Boram are classmate 3rd grade high school

Baro,Sandeul n Jiyoen are classmate 2nd grade high school

Gongchan n Hwayoung are classmate 1st grade high school

*i dont know school system in Korea,just think that 3rd is sunbae n 1st grade is hoobae

Jinyoung,CNU,Sandeul,Baro,Gongchan are housemate n B1A4 band members at school

JINYOUNG

the lead role,, high school student,, eunjung,CNU n Boram's classmate,,the kingka of the school,, has many girl fans but he still search his true love that he found at Canada 5 years ago,, he doesnt know his true love's face but keep heard her voice in his dream,  and also a leader of a band with name B1A4, attraction-his sweet smile

CNU

high school student,, eunjung,Jinyoung n Boram's classmate,,playboy,can make all girls melts with him easily,always want to compete with Jinyoung, B1A4 band members,,really rich(the house that all of them live actually his father's house),attraction-dance talent

Jiyoen/can also imagine as you hehe

the lead role,mix Canada n Korea but because she live too long in Canada she cant speak Korea fluently,,tomboyish girl who like to play basketball, go to Korea again because her father needs to transfer his job to Korea,you really likes to answer not logical question with harsh jokes,, will same class with Baro n Sandeul,attraction-really sweet voices, can play piano,and beautiful eyes 

Eunjung

high school students,, boram,jinyoung n cnu's classmate,,really fall in love with Jinyoung,, leader of cheerleader group,, really hate when see another girls with Jinyoung,,didnt notice that Baro fall in love with her.Jealous with Jiyoen.the prettiest in the school and being called as queen but that called will be taken

Baro

high school student,, Sandeul n Jiyoen's classmate,, fall in love quietly with Eunjung but keep his feeling because Eunjung is his noona,, reall like to joke n playing,, very close to Sandeul n Gongchan,attraction-he is gagman n always make jokes to calm his friends when sad

Boram

Jiyoen unnie,,live and school at Korea with her grandmother even her parents live at Canada,,really feminine n soft contrast to Jiyoen,,Jinyoung,Eunjung n CNU's classmate,,fall in love with CNU but cant approach CNU because shes too shy

high school student,,the maknae,,Hwayoung's classmate,,too close with hwayoung like sibling until dont know that they actually fall in love with each other,, to close with Sandeul n Baro..Gongchan is smart and hyperactive boy,,always does aegyo to the hyung when he wants something but also evil maknae n tricked the hyung

Hwayoung

high scool students,, Gongchan's classmate,, too close like a sibling with Gongchan until dont know they actually fall in love each other,, also like playing basketball llike Jiyoen

Sandeul

high scool student,,Baro n Jiyoen's classmate,, really talkative n friendly,,too close with Baro n Gongchan