Event 1: RaffleEdit
There is currently an event with these medals.
They are for a raffle to win in-real-life items.
Only Koreans may receive the items, so they are useless to foreigners. Just throw the medals away, or right-click them.
Event 2: Union CoinEdit
During the time period, 1000 Closers who are logged in can get 4000 more Union Medals. This event is by chance, but you have 4 times the chances to get 4000 Union Medals!