Dunamu, the operator of South Korea's largest cryptocurrency exchange Upbit, is considering appealing a $25 million fine and sanctions imposed by the Financial Intelligence Unit (FIU). The FIU has accused Upbit of violations in anti-money laundering (AML) and know-your-customer (KYC) protocols, leading to a three-month suspension on new user registrations. Dunamu is conducting an internal review and noted that previous FIU penalties have been overturned by courts. The FIU's investigation revealed approximately 5.3 million customer verification violations and 15 unreported suspicious transactions.