This study examines the return to education in South Korea by comparing metropolitan areas with non-metropolitan areas. It utilizes the Korean Labor and Income Panel Study from 2018 and 2019 for analysis, alongside the Mincer equation. The findings indicate that female workers have a higher return to education compared to male workers. The Oaxaca decomposition method reveals that private academies contribute to increasing differential treatment between men and women, whereas public education reduces the gap. Additionally, the regression discontinuity design method shows that the university premium is significantly different by region.