Krystal Jung sya ay isang simple girl who admired and dream na maging girlfriend ni Kim Joong In or Kai for short, Si Kai ay isang high school heartthrob in their school, he really hated the girl like Krystal because he hate girls who so much obsessed on him..... BUT.... One day, they realized that they fall in love to each other!!! Why? How? When? Watched out, how their love story began..... From a simple girl who admiring and dreaming, To became a real girlfriend.....