I've decided to add the caracters and their roles

so here it is

Hwang Hae=me

Kevin Woo=my ex BF

Kim Eli= my ex ex BF

the rest member of u-kiss= only cameo

Taemin= I cheated on kevin with him

key and jessica= my friend (the girl) and her couple

Onew=my friend who hit on me (this is imortant cuz well if anbody that date this guy has the higher popularty)

Jjong= another friend hit on me (imprtant cuz he's talented and handsome)

minho=Kevin's friend who lied about Kevin and date me for a few weeks

Krystal=Kevin's friend who is a player and like holding hands with Kevin even though Kevin refuse

Victoria=Kevin's friend who had a big crush on him and willingly do anything to get him

Sulli=Kevin's friend and he cheated on me with her