Kim Myungsoo

A really popular last year student
Even thought he has a bit cold appearance,  he's actually a really warm hearted person.
He's a little bit shy with strangers, but is a nice guy if you know him wel.
He takes care of his dongsaengs really well and always put his friends on the first place
His dad owns a restaurant and he wants his son to take over it, but he doesn't want to.
He wants to create his own future with the infinite boys
He treats Suzy as the little sister he never had, but is that the only thing he feels for Suzy?

Bae Suzy

Wooyoung's twin
They might be twins, but they have complete opposite personalities
She don't know how to act with strangers, so she will act a bit cold to them
But actually she's really kind
she can be a bit bossy sometimes, but she meant it well
A member of the dance group Miss A
Finds out she likes Myungsoo after he and Krystal get together again

Nam Woohyun

A friend from Myungsoo
He's very lively and have a lots of friends
He have the best advices and treats everyone nice
Because of his personality he gets a lot love from the girls, but none of them is the person he likes
He rather seeing his love happy with the person she loves, than winning her heart by himself
Likes Suzy

Lee Min(young)

Suzy's best friend
Has a lot of aegyo
She always act happy, but actually she's very lonely
She was Myungsoo and Sungjong's childhood friend
She likes Myungsoo, but he doesn't remember her anymore

Bae Wooyoung

Suzy's twin.
His personality is quite the opposite from Suzy's.
He looks warm hearted from his appearance, but treats everyone as cold as posible.
Especially girls.
He doesn't believe people too fast and only treats the 2PM members and his family in a nice way
He's the kind of the overprotective brother
Ex-boyfriend of Tiffany

Lee Jieun

Friends with Min and Suzy
She works at a music store with Hoya and Tiffany
She's a shy, smart, but extremely talented in music but sad enought she has stage fright
Secretly likes Myungsoo

Lee Sungyeol

One of Myungsoo's best friends.
He takes things sometimes too serious, but can be childish at the same time
He gives everyone a feeling like he knows everything, but if it comes to girls that he likes, he's the most clumsy person on earth
Had feelings for Krystal

Jung Krystal

The new popular and beautiful classmate of Min and Suzy
Even thought she acts a bit selfish and mean
She's actually a really nice girl who doesn't know how to express her thoughts
Broke up with Myungsoo in the past to let his dream come true
She came back after she found out she couldn't lose him, but would it be too late?

Hoya

Suzy and Wooyoung's neighbor
Works at a music store with Jieun and Tiffany. 
He gives everyone a good brother feeling
Has feelings for Tiffany

Hwang Tiffany

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Works with Jieun and Hoya at a music store.
Even thought she's the one who broke up with Wooyoung, she could never forget him
Guilty was the thing she felt after she found out what happend to him after they broke up
Is willing to do everything for Wooyoung to forgive her

Luhan

A member of EXO and a friend of Sungyeol
Even with his cute appearance he gives people a bit cold feeling
but actually he's just shy with people who he doesn't know just like Myungsoo
Became friends with Suzy after he found her necklace, but then he slowly start to fall for her