The study examined the causal relationship between the two Koreas and the establishment of an agenda for the inter-Korean summit through a comparative analysis of East-West Germany and the two Koreas, as well as the feasibility of follow-up measures. In other words, as the unification of the two Koreas is important to us, it was presented by comparing the feasibility of the agenda discussed at the East-West German summit and the inter-Korean summit, as in the case of unification Germany. The purpose of the study was to compare and analyze the relationship between the past divided East and West Germany's unification with the implementation of the follow-up measures, given that despite several inter-Korean summits, it was highly unlikely that the agenda of the summit would be implemented as a follow-up measure. As a result of this study, the policy measures are as follows. First, As played a role in reunification led by West Germany amid the financial crisis in East Germany following the collapse of the Berlin Wall in 1989 in the case of East and West Germany, the inter-Korean summit should focus on North Korea's change and set an agenda. Second, The inter-Korean summit needs to focus on key agenda items that can be agreed upon, like Germany rather than being led by North Korea and giving out goods and finances unconditionally. Third, Even if it transcends political factions and ideologies, future inter-Korean summits should be implemented based on reciprocity that served as the foundation for the reunification of East and West Germany. Fourth, As the success or failure of the inter-Korean summit depends on progress in denuclearization of North Korea and peace on the Korean Peninsula, which are issues of North Korea-U.S. relations, the agenda of the summit and its follow-up measures must be different from German reunification without an agreement on North Korea-U.S. relations.