Poon Sir is a senior educator who has been engaged in education for more than 30 years. He has served as principal, mathematics director, open test assessor, middle school mathematics textbook author and university lecturer. In recent years, Poon Sir has also served as a consultant and administrative work for some educational institutions, as well as teaching some children and running Olympic math classes. Poon Sir has discovered a lot of life principles from mathematics over the years. He hopes to help children build a better life through his own experience and enthusiasm for educating the next generation.