Kim Kalena : 

An average 15 year old girl that has two very different personalities from when she's at school to when she's at home. Because of her parents fighting 24/7, she is a fierce girl that knows how to fight back if anything goes wrong. At school, Kalena and her twin sister Jasmine, are total nerds. She's her only friend and Kalena's her only friend. 

Choi Hansol : 

The new heart throb of school. He hates how girls throw themselves at him and he finds Kalena interesting because she didn't fall for his charm or dashing looks at the start like the rest of the crazy fan girls around school. He's 15 years old and his passion has been dancing and singing from the age of 6. He doesn't know it yet, but he's going to find out that another passion of his, is love.

Jeon Wu Jin :
 

The queenka of school, she thinks she deserves the best. She used to be the twins' neighbor that they played with as a child. Kalena, Jasmine, and Wu Jin used to be called the 'triplets' because they would always play with each other until an incident happened and she moved away to America for a year. When she came back, she became cold and cruel to Kalena and Jasmine.

Kim Jasmine : 

The loving twin sister, she's older than Kalena by seconds and always nags her about it. She's just like Kalena in many ways except for looks, has more responsibility, shy, and she cooks better. Jasmine's shy personality keeps her from showing her mean side and people call her the weak one, because she doesn't freely express her anger, like Kalena. She dreams of love at first sight but can't find it, Until she meets Wonwoo, Hansol's best friend. 

Jeon Wonwoo: 

A quiet and secretive pabo who only talks to his friends, called seventeen, which includes Hansol. He doesn't look into things much and goes with the way of life. He also doesn't notice that the love struck Jasmine has her eyes laid on him because he thinks she's the same person as Kalena.

Kim Samuel :

The adorable little brother. He loves Jasmine more because she always cooks for him and as he says, "IT'S DAEBAK!" After he meets Hansol and the rest of Seventeen, he wants to join their group of friends. The guys think for a while and decides that if Samuel can attract some girls for them because he's adorable, they ensure he can join.

Color Codes : ( you don't need to memorize these.. It's more for us authors)