(Personality psychologist Jung described personality as a huge and mysterious system, and believed that "the greatest adventure in life is the exploration of the inner world". This exploration is the work of a lifetime. Personality psychology not only occupies an important position in the discipline system of psychology, but also plays a fundamental role in all life sciences, social sciences and humanities about people. It can add spirituality to our insight into how human society works. The 27 lectures given by Xu Yan, a professor of the Department of Psychology of Beijing Normal University and a senior doctoral supervisor, use authoritative theories and friendly explanations to make it easy for psychology lovers to get started with personality psychology.)