The Eungam Hana Public Kindergarten, Hana Financial Group’s first childcare facility in Seoul, is located in a dense urban area surrounded by old buildings with poor lighting and ventilation. The design responds through practical, data-based methods rather than abstract theory. A south-facing atrium improves daylight, while east–west openings enable cross ventilation. Emphasizing Korean Sustainable Adaptive Architecture, the project overcomes harsh site conditions with realistic solutions, creating a comfortable environment for children.