Characters:

Choi Sulli - Violet

A scholar in their school Tae San University, her bestfriend is Lee Taemin, she is bubbly, kind and beautiful. Her rival is Choi Minho from academics to perfomances, all things change when Minho and Taemin started to be her suitor.

Choi Minho - Blue

A handsome badboy in their school, his rival is Choi Sulli in times their fighting moments his heart is always beating faster and he doesn't know how to control it until he knew that he likes Sulli.

Lee Taemin - Green

He is Choi Sulli's best best friend, he protects Sulli from any harm, from the start he already liked her but keeps it as a secret, until he knew that Choi Minho likes Sulli he showed his feelings for her.

Krystal Jung - Orange

She is one of the best friend of Sulli, she secretly likes Taemin and becomes Sulli's biggest rival when she knew that Taemin is her suitor.

Kwon Yuri - Red

Minho's ex-girlfriend, she treats Sulli well and now hates Minho, she is like Sulli's big sister and just like Taemin protects her from any harm and that includes Minho.