In January, a woman passenger had her temperature checked at Incheon International Airport - and South Korea discovered its first case of coronavirus. In the hundred days that followed, the country would become a model for how to fight the virus. With unprecedented access from the first few hours of the outbreak, Laura Bicker tells the inside story of South Korea's virus hunters. How did they manage to keep the death toll so low, and what can the rest of the world learn from South Korea's story?