A cluster of new outbreaks in the South Korean capital Seoul has worried officials because the cases are popping up in densely-populated areas of the city.
The authorities say this coming weekend is a critical moment to prevent further infection. They have called for a stricter social distancing campaign over the next two weeks.
Public parks and museums will be closed both in Seoul and in surrounding cities. Businesses are being urged to encourage more flexible working, and people are once again being asked to avoid mass gatherings.
It comes after hundreds of school were forced to close as a result of the new outbreaks, just days after they reopened to millions of children.
The emotional plea from officials is: "Comply, for the sake of our children’s education."