Nishimura Riki/Ni-ki as your ex, way back then you broke up with him because of his coldness towards and can't handle it so you both ended up in breaking up. It was unexpected, you are already in senior high but same class with Ni-ki, your ex. But however, you don't even care because you already moved on but his friends Sunghoon, Jake, & Jungwon is teasing him about you because he still loves you, without knowing that you already moved on from him.

It was your first day of class and you were sitting nearby the window, Ni-ki was sitting behind your seat.