A South Korean businessman with a Singapore-based cryptocurrency firm got a nasty shock when he traded 2 million euros (about US$2.3m) in bitcoin for counterfeit money. A Serbian resident, was remanded in custody on charges of fraud and being part of an organised crime network.
https://www.finder.com.au/businessman-sells-e2m-of-bitcoin-for-wads-of-badly-forged-cash