This study aims to create a basis for sustainable conservation by identifying the heritage value of 166 Ikseon-dong. Based on old land registers and cadastral maps of the 1920s and 1930s, it interpreted the construction procedure, social background, and urban architectural characteristics of the road and plot subdivision of the modern Hanok district. Ikseon-dong Hanok produced four types of ground plans based on the grid-street system. This study argues that these innovative experiments have already been attempted through Bak Young-hyo”s proposals in his Geonbaekseo and the architectural activities of Jeong Segwon, and that the idea of applying various housing types, layouts, and grid-street system planning was embodied through the development of the Hanok complex in Ikseon-dong. Further, this attempt greatly influenced the design of other Hanok complexes built in colonial Gyeongseong after 1936, taking the Ikseon-dong Hanok as a role model. The radiation of new perspectives will be a groundwork for the future sustainable conservation of heritage places.