Education plays an important role on responding to the global issues caused by the globalization phenomenon during the late 20th century. One of them is the discourse of ‘Global Citizenship Education,’as many researchers focus on the educational goal and curriculum about this discourse from elementary to college education levels in Korea. This study examines the curriculum development and its operating status in each education levels based on the revised curriculum of elementary, middle and high school education since 2015. In particular, this study analyzes mainly on the organizing curriculum of environmental issues and sustainable development. In addition, this research explores college education system in order to develop this discourse as concentrating on the eight universities’ Global Citizenship Education curricula, initiated by Asia-Pacific Centre of Education for International Understanding under the auspices of UNESCO (APCEIU) in Korea. Lastly, this study suggests the importance of the discourse environment for elevating the sense of global citizenship through this study.