"Professor.. can we take a break, at least?"

You slump your face onto the book on the table, letting out a tired grunt.

"Its been only 1 hour and you're already tired? Quit whining and solve the questions" Juhoon sighed.

Professor Juhoon has became your private tutor since you failed on your math subject at college. You will always come over to study at his place and since you two are pretty close, he decided to help on you.