I the loser, the out cast, the fat girl who got called names, nobody knows my existence in school. Till I change myself... 

Donghae insulted me when when i was younger and fatter , and he's my major enemy. HE IS MY ENEMY WHY DO I HAVE TO STAY WITH HIM IN THE SAME APARTMENT ?! and why do i feel funny around him? 

You (Park Sora )

19 years old.

Really really fat from 9 yrs old – 17 yrs old, decided to go on diet at 18.

Insecure, low self-esteem, very smart

Family : Mum, dad and an older sister who is perfect.

Parent’s pet.

Jessica

18 years old

Your best friend since you were 7.

Became best friend because both your parents got close, and both of you along with her brother joongki hangout together often.

Grew up together.

Very demanding, but always protects you even though you are older.

Has total of 42 ex boyfriends, and always tries match make you up with other guys.

Donghae

20 years old.

The rich kid, the popular kid, the flowerboy, the narcissistic.

You have very bad impression of him.

Only child, but always neglected by his parents, as they have to travel a lot.

Deep inside, he craves for parental love.

Nickhun

20 years old

Your crush since you were 16 years old.

Flower boy. The popular kid In school.

His smile will melt you.

Nice and playful.

You have never ever spoke to him before

Song joong ki

19 years old.

Jessica’s brother.

Childhood friend, that always teases you, but care for you most. Has a crush on Uee…. Until one day… he became your guardian angel.

Common interest with you and is smart.

Chansung

Nickhun’s best friend, both of them along with donghae dominates the school. However none of them knows your existence.

Uee

20 years old

The queen be that manipulated the school.

Have the looks, but bad hearted.

Joongki, nickhun and donghae’s crush, and ideal type.

Has the image of a really kind girl.