On Wednesday, South Korea reported 91 new COVID-19 cases, 57 of which were local transmissions.
Of those, 40 were from the densely populated capital area.
That includes one high school senior, who has contracted the virus just 45 days ahead of the college entrance exam.
The student's high school in Incheon has set up temporary testing centers and halted in-class learning.
A lecturer from a cram school in Gangnam was also confirmed to have the virus, causing 60 students and teachers who have come into contact with the lecturer to go into self-isolation.
Students and parents are worried as the lecturer continued to give lessons despite having symptoms and took 4 days to get tested.
Schools and learning institutions are especially susceptible to outbreaks as classrooms are often crowded and students move around a lot.
In response, Gangnam-gu District will conduct preemptive testing on 20-thousand cram school teachers.
There have also been more COVID-19 cases at nursing homes and hospitals.
The government has come up with measures to curb infections at healthcare facilities, as patients there have a higher mortality rate and are more likely to need specialist medical care.
"The government has begun a full inspection of 160,000 hospitalized patients and healthcare workers in the capital area this week, and will conduct a special inspection of 8,000 long-term care hospitals nationwide starting tomorrow."
After the inspection, health authorities will look to improve any problems brought to light.
Kim Yeon-seung, Arirang News