In Harry Potter's novel, pictures of headmasters are kept in the headmaster's office, and their thoughts are preserved. This is explained as the headmasters use their experience and wisdom to guide and inspire students. As Harry's headmaster, Mr. Deng did guide Harry in this way and helped him overcome various difficulties and challenges. In Harry Potter's story, Professor Deng used his experience and wisdom to guide Harry to overcome various difficulties and challenges. For example, during his studies at Hogwarts, Dunn taught Harry how to understand the nature of magic and helped him solve various problems. He also told Harry about Hogwarts 'history and cultural heritage and encouraged him to protect and uphold the school's traditions and values. Therefore, it could be said that Old Deng guided Harry in this way and helped him become a good wizard.