Based on the experience of the MERS outbreak in 2015, laws were revised to supplement the areas that were lacking at the time. Korea Centers for Disease Control and Prevention were able to use relevant information in epidemiological investigations to contain and prevent infection, thus enabling the establishment of a more comprehensive management of infectious diseases. Furthermore, making accurate information available to the general public helps to minimize fear and confusion with respect to the risk of transmissibility of the disease. The use of methods that have objectively verified the patient’s route claims (medical facility records, GPS, card transactions, and CCTV) for COVID-19 contact investigations in South Korea has provided accurate information on the location, and time of exposure, and details of the situation, thus reducing omissions in a patient’s route due to recall or confirmation bias that may have arisen from patient or proxy interviews.