This study aims to contribute to the understanding of climate change adaptation policies in the context of seaweed aquaculture and coastal ecosystem management by utilizing Institutional Grammar 2.0 and the Coupled Infrastructure Systems framework. The research underscores the significance of comprehending the intricate interactions among various CIS entities and showcases the potential of IG in exploring the connections between stakeholders engaged in the policy process. The findings suggest that a comprehensive understanding of CIS dynamics could enhance the effectiveness and responsiveness of climate change adaptation policies across diverse contexts. The study identifies potential gaps in integrating natural infrastructure considerations, which may impact the capacity of these policies to address broader climate change adaptation goals and coastal ecosystem sustainability. Moreover, this study aims to demonstrate the broader applicability of IG and the CIS framework in the examination of policy-making processes, extending beyond the specific context of South Korea. The insights generated may help inform the development of more sustainable and adaptive policies across various sectors and regions, ultimately supporting the resilience and well-being of communities worldwide. By illustrating the potential of IG and the CIS framework, the research aspires to offer valuable contributions to the fields of institutional analysis and policy-making in the face of climate change and environmental challenges.