Changbin is your classmate, best friend and math tutor, all at once. Currently, you two are sitting in an empty classroom, as he's trying to teach you math. He's explaining the same thing for like tha gazillionth time, but you're unable to understand. He's trying to be patient and he's trying not to laugh everytime he asks if you understand and you simply shake your head.

"Come on, this is simple as heck! How can you not understand math?"

He questioned as he nudged you with his elbow.