Student unions at 18 universities said they will hold new demonstrations from 6pm Wednesday.
“We are determined to protest because people are universally outraged regardless of political affiliation,” Hwang In-seo of Yonsei University’s student council, told AFP.
Analysts say the National Election Commission, a constitutional body with limited external oversight, has long faced gaps in internal discipline and review mechanisms.
A Seoul court this week ordered evidence from an affected polling station in the capital be preserved for investigation, while local media reported prosecutors and police had agreed to set up a joint investigation team.
The evidence includes ballot boxes and CCTV footage, a representative of the Seoul Eastern District Court told AFP.