Cho and his accomplices are being charged with seven charges including child pornography, forced assault, intimidation, coercion, fraud, provision of personal information and alleged violations on the Act on Special Cases of Sexual Violence (hidden camera filming etc.). Police were able to identify Cho through dozens of seizure searches and CCI analysis over the past 6 months, international coordinated investigations and crypto-currency tracking they used to evade police.
Cho attracted victims through "part-timer model" jobs on SNS or chat apps and once he received their nude photos he would threaten them and call them "slaves", sexually exploit them and film them and distribute the videos through his telegram chat room "N Bang". Some of the victims were lured to certain locations and sexually assaulted by Cho's accomplices. Cho then distributed the sex videos through his 3-tier paid chatroom on Telegram where higher the admission fee, the more stimulating the video.
Among the chatroom members there were also "employees" instructed by Cho to sexually assault the victims or entrusted with tasks such as laundering money, managing sex videos, and operating the chatroom. There were also SNS personnel (public service workers) recruited by Cho through various community sites. Of the 13 arrested, 2 of them were SNS personnel who worked in ward offices and resident centers as "part-timers" and were tasked with extracting the victims personal information as this is how Cho threatened his victims. Police plan to investigate these officials as well for illegal activities. Among the 13 arrested, none of them had ever seen Cho or knew him personally. He instructed them to commit the crimes via Telegram so that his identity wouldn't be exposed. Cho was working as a journalist for a local university newspaper when he was arrested.
Police, who seized 130 million won in cash at Cho's residence, are tracking his crime profits expected to reach over hundreds of millions of won. A police official stated, "We will track down all of Cho's profits and apply for confiscations. We will also notify the National Tax Service of all proceeds and the prosecution for a strong sentence."
Police are also investigating “Gat God”, the operator of "N Bang" who's also known to have started the sexual exploitation activities. Gat ran 8 chat rooms (Rooms 1-8) on Telegram, threatening about 20 to 30 victims called “slave,” making all kinds of sexual exploits and distributing them through "N Bang". He passed his chat room to Watchman in February of last year and is currently in hiding. Currently, Gat God and Watchman are being tracked by different local police agencies.
sources: dailynaver, hani.co.kr
Asianjunkie also posted about this with slightly more information. There are currently two petitions going around, one to reveal the suspects identity and another one to reveal the names of the users in the chat rooms.