Feelings are very powerful
They make you feel joy, love, excitement, and much more...
But, because of these feelings, you could also feel pain, despair, and hatred.

Im Yoona

Im Yoona is someone who only feels the good side of emotions. She had a regular life with her friends, and with no such drama. Her family was not too poor, nor where they too rich. There was no despair in her life... so far. As she goes into adult-hood, she starts to doubt herself. All those emotions that she never felt before starts popping up, almost making her break down.

Cho Kyuhyun

On the other hand, there is Cho Kyuhyun. He, who is only two years older than Yoona, has felt depression, loneliness, and abandonment. He's a rough child and is afraid of commitment. He doesn't want to be left behind anymore. He then meets Yoona, a dorky little deer, almost breaking down. He helps her with her new life and also experiences the new warm and fuzzy emotions that he never felt before.

Also joining them in their little journey are:

Kwon Yuri
Jung Jessica
Ok Taecyeon
Kim Yesung
and
Lee Taemin/ Im Taemin