The most important feature of modern cities and architecture is diversity, and the collection of diversity appears as a result of the “Collective City.” To realize this, it is essential to understand that the most important element of the “Collective City” is the diverse individuals and their social groups. We believe that understanding people and their lives will be the first step in creating a “Collective City” that ensures democratic diversity. The purpose of this studio is to examine sustainability in another sense by preparing for an aging society and proposing several social and physical alternatives for older people, as well as architectural proposals to restore the historical value of Somaksa, a historical resource of Somak Village. We are going to present programs that will not simply create a comfortable environment for the elderly in the village, but also create an environment for the elderly to live on their own and create economic value. It is also intended to suggest the direction that the “Collective City” should be oriented towards through method and process. We hope our plan will be a good alternative in the face of our urban problem.