The German experience of political reunification and social integration can be a model for the divided Korean Peninsula in that the two Germanies achieved reunification while the two Koreas have yet to do so. This paper aims to explicate implications of the West German alien policy for South Korea. Similarly to West Germany, there are several kinds of aliens in South Korea: migrants (or refugees) from the counter-regime, immigrated brethren, foreign workers and multicultural people. West Germany, the second most economically powerful nation in the Western world has been consistent in its advanced policy toward East-German-migrants according to the related clauses of the constitution (Grundgesetz), and has implemented lasting programs. As such, this paper highlights the implications of the West German case for South Korea, such as consistency of the policy in spite of political instability.