What if one day you see your dream guy in your class? Will you fall in love with him? Or will things go terribly wrong? 

Who is that mystery boy that suddenly appear out of nowhere?

Why does he looks so familiar?

Irene as Bae Dal Jung (YOU)

Bae Dal Jung is a first year student at Narwal College, a prestigious school that everyone dreams to go. Dal Jung is very pretty, but her thick pair of glasses that sits on her nose and ugly hairstyle hides that fact.

Park Bo Gum as Kim Hwang Kee

Kim Hwang Kee is a mysterious boy that suddenly shows up in Narwal College. He is the eyecandy and crush of many girls but he does not seem to care about them. He is exceptionally good in music. But who on earth is he?

IU as Nam Jin Yoo

Nam Jin Yoo knows too much for her own good. She is the dream girl of every guy in Narwal College. She makes use to her beauty to get what she wants. She secretly admires Hwang Kee.

Lee Hyun Woo as Tae Woo Young

Tae Woo Young is a bright and cheerful guy. He is the polar opposite of Hwang Kee, but strangely, they are the best of the friends, and there is a reason behind it.