By April 30, all users of the South Korean exchange Coinnest need to withdraw any funds stored on the platform because the business is closing, according to a notice posted by the Exchange this week, CoinDesk reports. Coinnest was previously South Korea's third largest exchange. The reasons provided for the closure are vague, but CoinDesk reports that the business' past fiscal year has been difficult in addition to losing $5 million in a mistake airdrop in January 2019.