Local residents wait in line to buy masks at a supermarket in Daegu, about 300 km southeast of Seoul, capital of South Korea, Feb. 24, 2020. South Korea confirmed 231 more cases of the COVID-19 on Monday, raising the total number of infections to 833. (NEWSIS/Handout via Xinhua)

A local resident waits in line to buy masks at a supermarket in Daegu, about 300 km southeast of the capital Seoul, Feb. 24, 2020. South Korea confirmed 231 more cases of the COVID-19 on Monday, raising the total number of infections to 833. (NEWSIS/Handout via Xinhua)

A screen shows that flights between Jeju and Daegu are cancelled in Jeju, South Korea, Feb. 24, 2020. South Korea confirmed 231 more cases of the COVID-19 on Monday, raising the total number of infections to 833. (NEWSIS/Handout via Xinhua)