Since the COVID-19 pandemic, inter-country and regional confrontations have intensified and political and economic conflicts between regions have raised, building solidarity more important than ever. From this point of view, Jeju proposed Global Peace Cities Solidarity at the 2018 Jeju Forum and signed an agreement in 2021 is significant in that it can strengthen inter-city exchange and cooperation and ease conflicts between countries to improve diplomatic relations. At the point of transition to the endemic after the COVID-19 pandemic, each peace city will discuss joint projects for peace activities and discuss its vision to function as an international consultative body representing peace beyond future solidarity.