In recent years, Korean society has obviously trended toward polarization since the 1997 financial crisis. Mass-unemployment, decrease of real income and accumulation of income inequality by the financial crisis and the following economic reform has caused the economic base of the middle class to collapse. At present, such a collapse of the middle class results in the rapid growth of social polarization in Korea. Particularly, the social polarization and the spatial phenomena related to it appear more definitely in Seoul, which is the largest metropolis as the capital city. In this context, this study focuses on how social polarization is related to spatial polarization. It could be said, that social polarization consists of not just occupation or income related matters but is made up of more comprehensive matters, including lifestyle, recognition and attitude of regional difference, public service and investment, educational environment and so on. This paper is broadly divided into two sections. The first section depicts the general economic situation after the financial crisis in South Korea. Second, spatial characteristics of social polarization in Seoul are examined.