he sighs in irritably, somehow he got stuck with you in the library as your math tutor. he looks at you who is focuses on your book.

then he looks at his watch which showed 6:18 pm. this is a complete waste of his time, he should have gone home and relaxed at home.

he tapped your head lightly with his book. "ask what you don't understand and don't just stay silent!" he said exasperatedly.