The health authorities are on their toes because almost four-hundred students nationwide tested positive for coronavirus in the week ending this Wednesday.
According to the Education Ministry on Thursday, there were 395 cases among students from kindergarten to high school.
That's about 56 kids, on average, testing positive each day.
South Korea reported 698 cases on Thursday, 670 of them local and the rest from overseas.
Over 60 percent of the cases are from the capital region.
Cluster infections are popping up from family gatherings, daycare centers, bars, restaurants and churches.
Meanwhile, health authorities say some businesses were caught not following the prevention guidelines.
"Cases were reported at launderettes people weren't wearing face masks, there was no visitors' log and some even coughed without wearing a mask. At self-service study cafes, seats were not kept properly apart. And unmanned photo studios did not check temperatures or use visitors' logs and distancing measures were not kept in small unventilated areas."
Health authorities say, unmanned businesses should follow autonomous prevention measures like placing posters to remind people to check their temperatures and write in the visitors' log.
The health authorities also said they will watch the overall situation before making any changes to the distancing measures.
Until May 2, the capital region will stay at the level two distancing level, which means restaurants, cafes and gyms can open until 10 PM.
If stricter measures are applied, they'll have to close earlier, at 9 PM.
Starting from Thursday, central and local government workers will cooperate to inspect nine types of vulnerable spots like cafes, bathhouses and daycare centers.
Jang Tae-hyun, Arirang News.