'Sadongine' is the name of a team I formed with people from Cheolsan4dong. In the face of impending redevelopment, we came together around the shared idea: “Let us find what is worth preserving and preserve it.” We made books such as 〈The Houses of Cheolsan4dong〉, which records the houses of Cheolsan4dong, and 〈The Trees, Flowers, and Vegetable Gardens of Cheolsan4dong〉, which records the plants and natural environment of Cheolsan4dong.