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Seoul has experienced rapid economic growth and industrialization, and it has become the central city of South Korea. These densely populated urban spaces have undergone the urban heat island (UHI) phenomenon, wherein the temperature is higher than that of the surrounding areas. Green spaces constitute the primary response to this problem, yet Seoul has not yet taken measures to create small-scale green spaces, such as alley gardens. Therefore, this study analyses the case of alley gardens in Daegu and argues for the necessity of their introduction. Alley gardens in Daegu have proven effective in reducing heat and have influenced the residential satisfaction of residents in densely populated, old housing. After confirming that the concept of alley gardens can serve as a micro-urban planning tool to establish small-scale green spaces and alleviate the UHI effect in Seoul, we explored the target areas where alley gardens can be applied within Seoul. Through heat-related environmental indicators and social factor indicators, this study found that Mullae-dong is experiencing the UHI effect, and that the introduction of alley gardens would have a positive impact due to the concentration of small-scale, old residences. This paper establishes the rationale for applying alley gardens to Seoul, while also deriving the importance and implications for the dissemination and revitalization of micro-level urban environment policies.