This study reviewed the structural and operational systems of two professional learning communities in Korean society and analyzed their strengths and weaknesses: the Association of Korean History Teachers and the Communities of Elementary School Classroom Management. In order to analyze these cases, Robey’s organizational change model was used as a theoretical frame. Two research methods were mainly employed for this study: literature review and on-site interviews. The analysis found several strengths (easy accessibility, led by teachers’ initiative and autonomous will, abundant and practical teaching solutions) and weaknesses (financial burden, lack of theoretical background, sporadic participants). In conclusion, this study suggests three strategies for an educational leader who has an important role in developing a teacher’s professionalism: 1) Make an institutional effort to stimulate teachers’ motivation to learn, 2) Create a strong network of university professors and other experts for career advice, 3) Build a synthesized and consolidated system.