When he was small, Kai suffered a bad childhood. His parents got divorce and he is now living with his mother. Who would beat him up everyday and would order him around. Scared, he ran away from home to live with D.O, who is his friend. He only trusts D.O as he grows up and only could trust D.O. When he graduates from university and got a job as a dance instructor, he met Hyoyeon.

Hyoyeon grows up in a rich family; she is doing well with school and top students in school. Graduating from university, she is a CEO of her own dance academy. She would walk around the building to check on everyone. When she walked past Kai’s class starts to take an interest in him.