Respiratory tract infections caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) originating from China began in late 2019 and became prevalent worldwide in early 2020. Korea was one of the closest countries to China and was forced to go through this pandemic. In the absence of vaccines or effective antiviral drugs, we have no choice but to re-use the old preventive measures used by humans in the past. In this review, I would like to discuss the preventive measures used in Korea during the pandemic.