South Korea's daily COVID-19 tally is back in the two-thousand range for the first time in a week, with 2,50 cases reported on Wednesday.
Authorities largely blame more people going outside like to cafes and restaurants.
Such movements have increased in all parts of the country last week, up 3 percent compared to the week before.
That didn't necessarily lead to more infections in most parts of the country.
But it did in the capital area, which accounts for more than 70 percent of the total new infections.
"The density of the population and the pattern of cluster infections could affect the respective region's scale of the outbreak and the number of infections."
Authorities say the resurgence in the capital region is a "dangerous warning", especially leading up to the Chuseok holiday, when a lot of people will be traveling from there to the rest of the country.
They added the effects of the holiday on future case numbers will largely depend on that travel volume, urging people to stay at home.
Meanwhile, the government is now advising large hospitals to restrict the entrance of guardians and care aids unless they have proof of negative PCR tests.
Hospitals are recommended to keep track of those test results on an online server and check visitors automatically at the entrance.
Medical staff at the department of infectious diseases, will be advised to wear extra facial protective gear as well as a mask.
Lastly, authorities will make sure local public health centers can swiftly give vaccine shots to staff, patients, and care aids.
All these are aimed at preventing cluster infections like one in a hospital in Daegu, where more than 2-hundred cases were reported.
Lee Kyung-eun, Arirang News.