Siyeon has never been interested in dancing, considerably more, she never even tried to dance before, yet again, she was remaining in this dance class tutored by an exceptionally attractive woman Kim Bora; But soon she got afraid that the more she started to love dancing, the more she fell in love with the teacher.

Taemin left Minho 10 years ago but never told him why. He finally decides his ex-boyfriend deserves an explanation and gathers all the courage he has to write him a letter.

I just want you to know... Every morning when Sungyeol enters the classroom and walks to his seat, there is always a yellow post-it note waiting for him in the top right corner of his desk. It's always addressed to him and always starts with 'I just want you to know' followed with something about him that the writer has become fond of. There's never a signature at the end, not even the cliche 'secret admirer'. It's always just his name and an endearing message that leaves Sungyeol's he

Love Letters  - letters that show the way you feel about  someone. To show that you care and to make them  feel Loved. Admirer - A person who holds someone in a high regard.