In today’s Korean society, the crisis of rapid decline in local population, coupled with a decreasing population, poses one of the biggest challenges in preparing for future generations. Moreover, the issue of rapid decline in local population may present a significant threat to democracy, a foundational principle of the Constitution, beyond just being a concern at the level of industrial or administrative policies for balanced regional development. This article points out that democracy is also weakening due to the crisis of rapid decline in local population, and proposes solutions in terms of the implementation of democracy, focusing on institutions such as elections, political parties, and direct democracy. Firstly, from the perspective of localities and regional populations, there are issues with the proportionality of electoral districts and regional representation. As an extreme imbalance in population between metropolitan and non-metropolitan areas forms, the citizens of the latter experience weakened representation in the election of their legislators, leading to the emergence of large electoral districts or the abnormal setting of a single district for areas lacking regional homogeneity or community cohesion. Under the current small constituency plurality system, maintaining strict population proportionality presents a difficult challenge to overcome. To harmonize the proportionality of electoral district populations with regional representation, considering a constitutional amendment to transform the unicameral legislature to a bicameral system where the upper house has regional representation, or adopting a regional proportional representation system for legislative elections, are potential institutional changes that should be explored. Secondly, recognizing regional political parties as a way to promote local democracy could help enhance local political autonomy. Current Party Law recognizes only national parties, and the Constitutional Court has upheld these provisions. However, the essential function of a party is to participate in the formation of political will of the people, which does not necessarily have to be nationwide. Recognizing regional parties could bolster local democracy and should be considered for enhancement. Thirdly, in response to regional issues more actively and flexibly, the diversification of local government structures should be actively recognized, and strengthening direct democracy measures is necessary to address issues in areas experiencing extreme population decline.