Suzy and Hyosung are bestfriends eversince they're little . They treat each other like sisters . Since little , they always play and even go out together. They never even seperate. One day , Hyosung's parents sent her to overseas to study. Hyosung didn't even get to say good bye to Suzy. As they grow up , they met each other back . They decided to stay together in an apartment which Suzy's parents bought. Both of them went shopping and bumped onto 2 guys. The 2 guys are Yoseob and Gikwang. The boys started to fall in love with the girls. The 2 guys lived in the same apartment and they have another 4 people staying in their apartment ; Doojoon , Hyunseung , Junhyung and Dongwoon. They're like brothers. But , what about the complicated love ? Why is it so complicated ? Who's in love with who and what makes it so complicated ?

Bae Suji ; Being called as Suzy. She's a very pretty and cute girl who loves to be cute to her parents and bestfriend , Hyosung . She has an ex-boyfriend named Wooyoung . She was afraid to get hurt in love again so she promised herself not to fall in love anymore. But , she can fulfill her promise because she fell in love with her. Someone who's nice , cute and handsome to her . Because of that guy , she's always smiling to herself no matter what. She don't know whether to trust him or not .

Jeon Hyosung ; A very cute girl . She loves to take photographs a lot. She loves fashion and shopping . Her parents dislike when she is being friends with Suzy . She cared for Suzy a lot until she doesn't obey her parents. Unlike Suzy , she doesn't experience love before . She don't know what's love and the feeling of it. All this while , she has been concentrating on studies and not about love. She have feelings for a guy but confused whether it's feeling of love or feeling of just friends . 

Yang Yoseob ; A very cute guy . He's being known to his friends as a King of Aegyo. He's full of aegyo that will either make people happy or cheerful. It's different for s , they called it AEGYO THAT CALLS FOR A PUNCH. They feel annoyed and irritated when he did his aegyo. He loves taking photos a lot . And most of his pictures is acting cute . He bumped onto a girl in the shopping mall and began falling in love with her. Even though he don't her whereabouts , he knew that she's a nice girl.

Lee Gikwang ; He's a handsome and muscular guy. He loves to exercise and work on his abs/muscle. He cared for Yoseob like his own hyung . He has an ex-girlfriend name Ji Eun , or more specific , IU. His love towards her faded away after he get to know that he has another guy. On the same day as Yoseob bumped onto a girl , Gikwang also bumped onto another pretty girl. He started to fall in love with her but always be careful so that he won't be hurt anymore like how he got hurt by his ex-girlfriend. 

Other B2ST members ; Doojoon , Dongwoon , Yoseob , Gikwang , Hyunseung , Junhyung