With the creation of the Sunshine Policy and its outcome on inter-Korean relations, numerous scholars began highlighting the cultural factors of norm and state identity as a means of understanding and explaining changes to the inter-state relations on the Korean peninsula. Previous studies pay attention to the changing character of the military conflict between three states including the Republic of Korea, the Democratic People Republic of Korea and the United States. In following the concepts drawn from the constructivist tradition, this thesis argues that the problem of previous constructivist studies is not inappropriate concepts such as norms and state identity, but the shortage of attention paid to the process of transformation in state identity. Therefore, this thesis draws more attention to constructivist traditions because of their significance when regarding concepts relating to norm and state identity in analysing inter-Korean relations.