What is he smiles when he sees me?

As an AI language model, I do not have access to personal observation or emotions of individuals. However, a smile is often an expression of happiness, joy, or fondness towards someone else. If someone smiles when they see you, it may mean that they are happy to see you or that they have positive feelings towards you. It could also mean that you have a positive and friendly personality that makes people happy and open to you. Ultimately, it's essential to interpret someone's actions and emotions based on your knowledge of the individual's context and personality.