The goal of this study is to explain the process of becoming physical education teachers prior to the entry to teaching profession, factors that influenced the view of teaching after entering the teaching profession, process of formation of teacher professionalism and the educational significance deriving from teaching profession through the teaching profession life of middle school physical education teachers that are facing voluntary resignation. To achieve the goal, 1 physical education teacher, who has been working for 37years, was selected as the study participant. As the qualitative research method for this study,‘oral life history’method was used, and the specific data collection included in-depth interview, participant observation, photos and articles. Results obtained through such processes are as follows. First is the establishment of correct view of teaching and silent practice. Participant has established a correct view of teaching and practiced it silently throughout the long teaching career. Despite the opportunity to choose money, fame and authority from a wealthy family, participant chose teaching profession. Second, he lived a life of ceaseless endeavors. Continuing one job for a long time would often lead to mannerism, but he continuously spurred him self to improve his expertise as a physical education teacher. Sports was the most fun to say that he was addicted to sports, and the participant felt very happy teaching sports to others. Third is the everlasting love for students. Participant served as the class home room teacher, which most highly experienced teachers avoid and shift the responsibility to short-term teachers, until 4 years prior to the resignation, and served as the manager of tennis team at the last school before resignation and taught students with love. Such results imply that the establishment of correct view of teaching and formation of professionalism through the teaching career have a great influence in the teaching career.