Local residents take an escalator in Seoul, 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, and the death toll rose to eight. The country raised its four-tier virus alert to the highest "red" level on Sunday as the virus infections soared for the past week. (Xinhua/Wang Jingqiang)

Local residents do some shopping at a supermarket in Seoul, 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, and the death toll rose to eight. The country raised its four-tier virus alert to the highest "red" level on Sunday as the virus infections soared for the past week. (Xinhua/Wang Jingqiang)

A man walks on a street in Seoul, 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, and the death toll rose to eight. The country raised its four-tier virus alert to the highest "red" level on Sunday as the virus infections soared for the past week. (Xinhua/Wang Jingqiang)

Local residents do some shopping at a supermarket in Seoul, 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, and the death toll rose to eight. The country raised its four-tier virus alert to the highest "red" level on Sunday as the virus infections soared for the past week. (Xinhua/Wang Jingqiang)

Local residents wait to pay at the counter in a shop in Seoul, 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, and the death toll rose to eight. The country raised its four-tier virus alert to the highest "red" level on Sunday as the virus infections soared for the past week. (Xinhua/Wang Jingqiang)