Sunoo was you're enemy since kinder,let's just say you both were childhood enemies,you both really hate each other to the point that you both rather to move to a different country just to be separated..

Another day on going to school another irritated day nothing's new..

You rolled you're eyes and went inside the school but someone stops you suddenly

Sunoo: STOP! sunoo said shaking his index finger as he stared at you

Sunoo smiled at you in a sarcastic and mischievous way