This document discusses extending open data and big data initiatives in the public sector in South Korea. It provides an overview of open government efforts by the Seoul Metropolitan Government, including increasing transparency, opening more public data, and using big data for various policy cases. It also discusses extending data efforts by expanding the range and types of data shared, unifying access across different levels of government, and linking related data. Finally, it emphasizes the need to extend participation by strengthening the open data ecosystem through increased sharing and engagement among data owners, consumers, cooperators, and providers.