It was in line with the estimates by the Bank of Korea (BOK) and the Ministry of Economy and Finance.
The state-run think tank forecast that the economy would expand 4 percent in 2021 thanks to the brisk export and the improved facility investment.
The BOK and the finance ministry set this year's economic growth outlooks at 4 percent and 4.2 percent each.
The KDI said the country's private consumption would increase 3.5 percent this year before picking up 3.9 percent next year amid the robust domestic demand especially in the services industry.
The services industry is forecast to rapidly recover next year amid a higher vaccination rate against the COVID-19 that would help people return to normal life.
Growth among manufacturers could be restricted for the time being by the global supply disruption, the KDI noted.
The KDI predicted consumer prices to rise 2.3 percent in 2021 and 1.7 percent in 2022 respectively.
Those are 0.6 percentage points higher than the KDI's previous forecasts unveiled six months earlier.
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