South Korea reported 119 new coronavirus cases on Monday, raising the total number of infections to 21,296.
The daily caseload stayed below 200 for five straight days, but it had continued to grow in triple digits since August 14, reports Xinhua news agency.
It was attributed to cluster infections in Seoul and its surrounding Gyeonggi province linked to church services and a massive rally held on August 15.
Of the new cases, 47 were Seoul residents, 30 from Gyeonggi and 11 were imported.
Two more deaths were reported which increased the death toll to 336.
The total fatality rate stood at 1.58 per cent.
A total 151 more patients were discharged from quarantine after making full recovery, pulling up the combined number to 16,297.
The total recovery rate was 76.53 per cent.
Since January 3, the country has tested more than 2.05 million people.