This Korean publication is a report of Yonhap, three of its three have not been detained for embezzlement and other charges. These allegations of fraud have allegedly demanded around 270 billion live investors from all over the world, which is promising for large returns for the ether mining operations. The officials of the Incheon District Prosecution Office have expressed doubts about the involvement of 21 persons, in which the mining Max LLC is a US based firm.
source - https://www.ccn.com/250-million-ethereum-mining-scam-korean-prosecutors-file-charges/