This case study examines Korea’s use of participatory and collaborative approaches to policymaking through the Open Policy Lab (OPL), supported by the Korea Institute of Public Administration (KIPA). The OPL functions both as a platform and a structured methodology, bringing together subject-matter experts, frontline practitioners, and other stakeholders to co‑create policies. It focuses particularly on early‑stage policy design under conditions of uncertainty and complexity. Led by Korea’s Ministry of Interior and Safety (MOIS), the Open Policy Lab has played a central role in advancing public sector innovation by integrating collective intelligence, operational expertise, and structured deliberation into agenda‑setting and policy formulation.