Korea is one of the largest emitters of greenhouse gases among OECD countries, with buildings accounting for 20% of total energy consumption. To address this, the Revised National Greenhouse Gas Reduction Roadmap for 2030 aims to double reduction targets for buildings, focusing on stricter energy standards for new constructions and promoting green remodeling. This trend aligns with global efforts, as the IEA Future Technology Scenario (FTS) projects a 75% reduction in emissions through energy efficiency in the building sector. However, current building technologies face limitations, such as defects from sequential on-site construction and slow adaptability to environmental changes. To overcome these challenges, a smart exterior material-facility convergence system, called the Incremental Unitary Envelope System (IUES), is emerging as a solution. This system integrates prefabrication and modular construction methods, enhancing energy efficiency, safety, and scalability. This paper introduces the development and implementation of the IUES, tested in a feasibility module and proposed for further demonstration. By focusing on key factors such as airtightness, insulation, seismic performance, and constructability, the system aims to improve building performance and reduce on-site labor. The IUES is expected to play a crucial role in advancing zero-energy buildings and remodeling projects, particularly for aging structures, while promoting a safety culture in the construction industry.