The Grandmaster

You have been an apprentice to the Grandmaster for a few months now. He is one of the best in the profession and has taught you a lot during this period. However, the Grandmaster is a peculiar man. He is very private, and this also applies to his study. A few days ago, you were looking for a pencil sharpener in his workspace. When he saw you, he freaked out and roared that you should leave immediately. Over the next few days, various questions haunted your mind: Why is he so mysterious? Why aren't you allowed in his study? Is he perhaps hiding something? Something just doesn't add up... Now, the Grandmaster has stepped out for an external appointment. Your curiosity prompts you to decide to take a peek in his room anyway... Can you unravel his secret?