The personal information of Kim Nok-wan, accused of producing sexual exploitation material or sexually assaulting 234 victims over five years from May 2020 to January last year, has been disclosed. Courtesy of Seoul Metropolitan Police Agency

The Supreme Court on Thursday upheld a lower court's life sentence for the leader of a Telegram-based sex crime ring accused of sexually exploiting 261 people, the largest number of victims recorded in a domestic sex crime case.

The top court also approved the lower court's orders for Kim Nok-wan, 34, to wear an electronic monitoring device for 30 years, be barred from working at institutions serving children and adolescents, and have his personal information published for 10 years.

Kim was found guilty of running the crime ring known as "The Vigilantes" from August 2020 to January 2025, producing and distributing sexual exploitative videos, coercing victims into appearing in illegally produced videos and sexually assaulting children and teenagers.

Members of The Vigilantes also blackmailed men and women into submitting nude photos of themselves and used them to produce and distribute sexual exploitation videos.