The COVID-19 pandemic destabilised the political, social, and economic life of countries as it spread around the world. It posed multiple threats to individuals, societies, and across different domains of life, highlighting their intersectionality and uneven impacts. The paper focuses on the UK and South Korea, countries which took very different paths in framing and addressing the crisis. It draws on secondary data and an integrated critical human security and state capacity approach to compare how state responses, institutional capacity, and the mobilisation of policy instruments themselves construct constellations of insecurity which intersect with human security and vulnerability. It will demonstrate the structural constraints that have continued to shape vulnerability and the dynamics of human security and insecurity in turbulent times.