Sulli and Jay are fraternal twins who could pass off as identical twins. What happens when the mischievous Jay asks his sister to disguise herself as him to attend boarding school while he goes off to attend a dance competition in London? Trouble! What awaits Sulli as she figures out that her roommate is her sports idol, the famous high school soccer player Choi Minho?

Sulli:
Jay's twin sister. She has always loved watching people play soccer but due to her heart condition, she has never been able to play or do extreme sports.
Unlike all the other fan girls, she idolized Choi Minho for his skills in soccer.

Jay:
Sulli's twin brother. He has always dreamed of becoming a professional dancer. Unlike Sulli, he does not suffer from a heart condition. He often blames himself for Sulli's illness.

Minho:
He is a famous high school soccer player in Korea. His goal is to become a professional soccer player and he dreams of one day playing for the national team abroad in the United Kingdom.

Siwon:
Jay and Sulli's older brother. He is practically their guardian because their parents are abroad and busy with work.  He loves and adores his twin siblings because he finds them incredibly cute!
 

...more characters to come.