The practice of medicine today is beset with unprecedented challenges which include public distrust in medical profession, increasing market force and strengthened management. Recently medical professional societies in UK & USA are overcoming these challenges in the way that medical professionalism is modernized in a changing society. They set 'a physician charter' and new definition of medical professionalism as a partnership. The principles of new medical professionalism are patient welfare, patient autonomy and social justice. It describes doctors' commitment to integrity, compassion, altruism, continuous improvement, excellence, working in partnership, just distribution of finite resources, maintaining trust by managing conflicts of interest and others. New professionalism support improvement of health care system for the welfare of society and the collective human dignity. Experience of rebuilding medical professionalism in UK and USA will give a lesson to Korean medical profession when they seek for solution to restore public confidence and take the leadership in Korean healthcare system.