The figures announced by the Korea Centers for Disease Control and Prevention on Wednesday brought national totals to 11,590 cases and 273 deaths.
All but one of the new cases were reported from the densely populated Seoul metropolitan area, where hundreds of infections have been linked to entertainment venues, church gatherings and a massive e-commerce warehouse.
Mayors and governors in the greater capital area have shut thousands of nightclubs, hostess bars, karaoke rooms, churches and wedding halls to slow the spread of the virus.
But despite the spike in transmissions, the government has been pushing ahead with a phased reopening of schools, which began with high-school seniors on May 20.
Class openings were planned Wednesday for nearly 1.8 million children -- high school freshmen, middle-school juniors and third - and fourth-grade elementary school kids. (AP) RS RS