This study examines how right-wing narratives in South Korea shape peacebuilding on the Korean Peninsula through the lenses of ontological security and peace anxiety. Because the Korean division is a protracted conflict, institutional agreements alone cannot achieve lasting peace; transforming antagonistic identities and societal narratives is also essential. During transitions from conflict to peace, uncertainty heightens psychological resistance to peace initiatives, reflecting a desire for ontological security. Through an analysis of discourses among young conservative activists, the study shows how securitization constructs North Korea and China as explicit “enemies,” converting uncertainty about the future into fear. These narratives provide a social foundation for strong opposition to peace policies by depicting them as existential threats. The findings suggest that effective peacebuilding requires not only military and political agreements but also leadership and social integration strategies that address peace anxiety and manage internal tensions. By reframing limitations of South Korea's peace discourse through ontological security, the study underscores the need for psychosocial approaches to mitigate persistent resistance in implementing peace policies.