South Korea plans to start inoculating 50-to-59 year olds in July.
Teachers, high school seniors and others preparing for the national college entrance exam are also included in the rollout.
The exact details about reservations and inoculations for this group will be announced in the coming weeks but officials say reservations will mostly be done online just like for senior citizens.
July also marks the beginning of the main Pfizer rollout, not only at major vaccination centers but also local medical clinics.
"Out of 13,000 entrusted medical institutions nationwide, we will select 1,500 facilities capable of storing and offering the Pfizer vaccine through a demand survey in the third quarter."
The country reported 629 new cases of COVID-19 on Thursday, dropping down to the six hundreds after a sharp hike the day before.
620 of those cases were transmitted locally with over 400 coming from Seoul and the surrounding area.
A recent outbreak at a bar in Daegu is now being linked to more than 200 patients as cluster infections at entertainment facilities around the country continue to add to the tally.
Meanwhile, fourteen Korean nationals returning home after testing positive for the virus in India, the current epicenter of the pandemic, will arrive at Incheon International Airport on a chartered, "air ambulance" flight at eleven-thirty-five PM.
One of them is reportedly in critical condition and will be immediately hospitalized upon arrival.
South Korea's total number of COVID-19 cases now stands at 138,311.
There have been three more fatalities, raising the death toll to one,943.
Han Seong-woo, Arirang News.