This study examines how major countries are broadening their cybersecurity strategies and considers the implications for South Korea’s Cybersecurity and the role of its National Assembly. The research employs keyword analysis and network mapping to highlight a shift from traditional focuses on information security and network defense to more comprehensive strategies. These strategies encompass supply chain security, technological and industrial capacity building, the creation of robust cybersecurity ecosystems, holistic societal engagement, and enhanced international cooperation. In response to rapidly evolving technologies and emerging threats, nations are emphasizing stronger legal enforcement and fostering ecosystems that promote public-private collaboration. Although the Republic of Korea has expanded its cybersecurity efforts to include both defensive and offensive capabilities, there remains a need to bolster institutional effectiveness by enhancing law enforcement measures and developing collaborative frameworks between the public and the private sector. As cyber threats continue to evolve, strengthening legal and institutional foundations and adopting inclusive approaches that engage businesses, academia, civil society, and individuals become increasingly important. This study underscores the crucial role of the National Assembly in enhancing the Republic of Korea’s cybersecurity readiness, calling for active political engagement and legislative action.