UNESCO conducted a cross-national study on the issue of integration of early childhood care and education services within education in 2008-2009. In order to have a more comprehensive understanding of the issue, UNESCO undertook a review on a parallel ECCE system in the Republic of Korea by the request of the Korean Ministry of Education, Science and Technology. In this article, an overview of the Korean ECCE system is provided with a brief appraisal of the quality of the Korean ECCE system by referring to selected quality, access and financing indicators. We highlighted positive developments of the country in recent years and discussed issues and challenges that are directly or indirectly related to integration. The challenges include demographic changes and their implications for the parallel system, and uneven qualifications, training and working conditions of childcare and kindergarten staff. Based on observations during the review visit, we analyzed several integration options and provided related policy recommendations.