The purpose of this study is to understand the trend of South Korea's Entrepreneurship Index over an 8-year period from 2015 to 2022, as reflected in the Global Entrepreneurship Monitor (GEM) reports, and to analyze it in conjunction with the matured domestic entrepreneurial ecosystem, providing insights by indicator. Using the data exclusively from GEM reports for South Korea from 2015 to 2022, the study analyzed the trends of expert survey data across 9 domains (A to I) from both domain-specific and comprehensive perspectives. Subsequently, considering 6 elements of policies, funding, culture, support, human capital, and market in South Korea's entrepreneurial ecosystem, the study analyzed how 30 years of policy, institutional, and program changes and efforts influenced the 8-year GEM expert index. The research findings reveal that over the past 30 years, South Korea has made various efforts to foster the maturity of the entrepreneurial ecosystem, including diverse policies, entrepreneurship programs, expanded funding, enhanced entrepreneurial awareness, technology commercialization in universities and research institutions, and entrepreneurial education. However, despite significant advancements in South Korea's entrepreneurial ecosystem, there are areas for improvement in terms of policies, funding, culture, support, human resources, and market aspects. This study provides insights and recommendations regarding these areas for improvement.