the main characters are

sehun - kyrstals ex- botfriend, possible bi-ual

kai - sehuns room mate, likes sehun

chanyeol - hes a grandmas boy, sehuns other room mate who is kinda weirded out by kai, really likes yoona.

yoona - friends with jessica, secretly likes chanyeol

kyrstal- jessicas sister, sneeks around to see if she is right about sehun

jessica- krystals older sister, helps kyrstal sneek, tries to get yoona and chanyeol together

the other characters are

kyuhyun- the news reporter

yunho- the ticket guy

changmin- the lifeguard

yoogeun- the baby who seems to know everyone

boa- the suicidal one

Taeyeon- chanyeols ex- girlfriend 

siwon - taeyeons current boyfriend