The purpose of this paper is prospecting the reliable way of describing unification between South and North Korea's different literary histories. Firstly this paper deal with the merits and demerits of literary histories of South and North Korea. The history of North Korean literature have distinct materialistic conception of literature, and that is influenced by political ideology. The history of South Korean literature have diverse point of view, but occasionally lack of distinct issue. This paper propose the wisdom of 'conciliatory but not accommodating(和而不同)' as principle of unifying South and North Korea's different literary histories. And insist that the trend of literature of subscribing unification history is flexible realism. Lastly this paper submitted that common ideological background of unifying history between South and North Korea's different literature Is post-colonialism.