https://www.sciencedaily.com/releases/2020/08/200810141006.htm
The Three Major Keys to South Korea's Success
South Korea conducted rigorous and extensive epidemiologic field investigations for coronavirus cases. This process included interviews with patients and triangulation of multiple sources of information (e.g., medical records, credit card and GPS data). The Institute for Future Government's survey in 2020 found that 84% of South Koreans accept the loss of privacy as a necessary tradeoff for public health security.
South Korea is a democratic unitary political system. The local governments have limited autonomy and its public health governance is centralized, enabling South Korean agencies to act quickly to implement policy decisions at the local level. After the MERS outbreak in 2015, the South Korean government expanded legal and administrative boundaries regarding pandemic responses, enabling public administration to acknowledge the different procedures. For example, the Infectious Disease Control and Prevention Act was amended significantly to prevent infectious disease and secure the public's right to know through surveillance and tracing techniques.
Lastly, the public health budget and flexible fiscal management systems allowed the South Korean government to provide adequate resources. The South Korean government and national health insurance program shouldered the full cost of coronavirus testing, quarantine, and treatment for Korean citizens and noncitizens. Furthermore, on March 17, 2020, the South Korean Legislature passed the supplementary budget of 11.7 trillion KRW ($10.1 billion) in 12 days. The Korean Ministry of Health and Welfare's (KMHW) supplementary budget passed in March 2020 is 3.7 trillion KRW ($3.2 billion), which enabled the KMHW to increase COVID-19 prevention and treatment facilities and to support medical institutions and workers.