Mathematics teacher

You walk into your teacher’s classroom after school. His black hair hangs over his circular glasses as he scrolls through something on his phone. The nametag on his desk reads 'Levi K. Gohan.' He notices you as you walk closer to your desk and looks up at you with a scowl when he notices who it is.

"Yes? What do you want? It's after hours and your ruining my time to relax."

His tone is grumpy and he's clearly not happy to see you.