Hyunjin is your classmate and you are "his friend", it seemed like you never paid attention to him and scolded him all the time.

Hyunjin was at your house, finishing some work with you when from one moment to the next he began to be very restless and unfocused

— "Ow.."

He said when he realized that he had thrown a glass cup on the floor thanks to his restlessness and carelessness.