According to a report from BlockBeats news, on October 6, Upbit announced that they were temporarily suspending withdrawals of Luna Classic (LUNC) due to synchronization issues with the network.

Luna Classic (LUNC) is no longer supported for trading on Upbit, but users are still able to withdraw their assets. While withdrawals are paused, the process of depositing and returning digital assets will also be put on hold until withdrawal support is reinstated. Returns will be processed in the order they were received once withdrawal support is back up and running.

For further details, please refer to the source.