The South Korean government's so-called "vaccine incentives" will be reevaluated if the country fails to reach its target of inoculating a quarter of its population by the end of June.
Officials say the rules can only be eased if at least 13 million Koreans get their first shot by then.
"If first doses have not been given to 13 million people by the end of June, then we cannot achieve the government's goal of inoculating 25 percent of the population.
In that happens, we will have to reevaluate how these incentives are applied from July as we analyze our population's level of immunity."
The government on Wednesday announced the details on how restrictions are to be eased for people who've been vaccinated.
For example, from June, people who've had at least one shot can meet with a larger groups of family members.
And from July, those who've had at least one shot won't have to wear masks at some outdoor places like parks and trails.
Those who've had two doses will be exempt from the ban on gatherings of five or more people.
Some experts, though, are saying that it's too early to ease restrictions on people who've only had a single shot.
They say that doing so could allow the virus to spread, and that people without masks could still be at risk of catching a variant strain.
But in announcing the plan Wednesday, the government said it's very unlikely for the virus to spread outdoors or for it to spread to people who've gotten at least one dose.
Seo Eunkyung, Arirang News.