[영문]In 1999, social assistance in Korea which had a Poor Law tradition for about forty years, was finally reformed and a new social assistance law, the National Basic Livelihood Security Act that aims to protect fundamental human rights, was enacted. It is evaluated as an epoch-making law elevating the level of the Korean social welfare one-step. However, given that most social policy initiatives in Korea came from the top rather than from below, it is quite noteworthy that the law-making process of the National Basic Livelihood Security Act was led by NGOs and not by the government administration. This article therefore explicates the driving forces behind social assistance reform in Korea after the 1997 economic crisis, focusing on the enactment process of the National Basic Livelihood Security Act. This case study shows a pattern of policy development primarily driven by NGOs' 'interests', with President's 'interests' and 'environmental' factors (the outbreak of the 1997 economic crisis) playing a supplementary role.