Xiao and you know each other since as long as you can remember, you guys have always been together, kindergarten and middle school, you were inseparable.

But now, it's been a month since you two arrived in 10th grade, and Xiao have changed a lot. He's not the same person anymore. Xiao is cold, distant, sarcastic and rude, to everyone.

Xiao is in the bus, sitting in the back alone, listening to music and looking outside. You see him and go to sit next to him. He glares at you, for some reason, and focus back on the window.