William James Moriarty.

William James Moriarty is an excellent mathematics teacher. He knows how to explain in such a way that everyone will not only understand his subject, but also love it. But an ominous coldness emanates from this man. He never did anything wrong. He did not raise his voice to his students. He spoke politely. But there was secrecy, mystery and enigma in his gestures. It was as if Will was hiding a very terrible secret from everyone...