A story that tells of a teenager named Joo Yoora, aged 20 years of hard living after the death of her father three years ago. Have a childhood friend named Yoochun, who always with her as hard or easy. Things started changing little by little as one day, Yoora met with Yunho. 

 Character 

Joo Yoora: A girl aged 20 years. Began life difficult after the death of her father. Have a talent in writing lyrics and composing songs. Leader of the Tri-Angle. Although only a high school graduation, she was a smart girl. 

 Jung Yunho: A senior at the university and a great friend to Yoochun. He was a humble and wise to keep a secret. A deputy chairman of the company owned by his family and manager of Tri-Angle.

 Park Yoochun: Yoora best friend since childhood. Humble and not boastful love with his family's wealth. Always offer help in times of need Yoora. He wants to protect Yoora.  A smart boy and a teacher who taught Yoora about music. Very enthusiastic in creating songs and writing lyrics. Music is his life. 

 Kim Jaejoong: A very famous music composer and lyric writers who do not believe in love after the accidental death of her lover. Always blaming himself is the cause of death of her lover.

Kim Junsu: The only friend that Yoora have during their training at the academy. A cheerful and good heart. Helping those who need help. A member of the Tri-angle.

Shim changmin: The youngest member of Tri-Angle. Always concerned about his own, but in silence, he is still thinking about others. Foresight and maturity thought. For him,  food is his wife