The purpose of this paper is to investigate the nature of null arguments in Korean. Even though many studies have been done to identify the null arguments, there seem to be some problems yet to be resolved in identifying them. The pro analysis of Ahn & Cho (2010, 2011a, 2011b, 2012) is likely to have wider explanative power than the DP ellipsis analysis because of the extensive uses of pro in Korean. Nevertheless, it is argued in this paper that the DP ellipsis analysis may be still applicable to constructions in which null arguments related to reflexives are missing.