Starting from Thursday, anyone over 30 years old can reserve and receive a leftover vaccine on the very same day.
These leftover vaccines are ones which had been reserved by someone else who didn't show up or couldn't get jabbed due to bad health on that day.
Medical facilities with leftover AstraZeneca vaccines will upload the necessary information to the Korea Disease Control and Prevention Agency's vaccination system.
Those wishing to get these can search which inoculation centers have leftover vaccines using Naver or Kakao.
Typing the keyword "no-show vaccine" shows the number of available doses at each medical facility.
Once you make a reservation, the page will show the latest time you can reach the center by in order to get the shot.
The leftover shots are available on a first-come-first-served basis and you can apply for them no matter where you live.
People can also select up to five medical centers to get an alert from whenever there's a leftover shot.
Arirang confirmed with health authorities that foreigners with public health insurance can get the leftover vaccines as well.
They should use their registration number to get an authentication certificate on Naver or Kakao.
The leftover vaccines are not available to anyone who has already had their first shot or is under the age of 30.
The second shot will be administered at the same medical facility 11 weeks after the first.
South Korea on Thursday started its rollout of AstraZeneca to more than five million people aged 65 to 74 and nearly eight thousand people with severe respiratory illnesses.
The KDCA commissioner Jeong Eun-kyeong visited one of the medical facilities to encourage staff and people who came for inoculation.
She said, vaccines can't be evaluated based on their type and price and that she can confidently say that the AstraZeneca vaccine is safe.
The country aims to give first doses to over 13 million people aged over 60 by the end of June so that they can ease the social distancing guidelines from July.
Jang Tae-hyun, Arirang News.