마스터카드 이벤으로 받은 코드가 안되서 메일로 문의하니까 이렇게 답장왔는데 네이버 번역으로 돌려봐도 뭔소린지를 모르겠어서 ㅠㅠ
Please open a Player Support ticket in-game, and Riot Games can help resolve this. You can title the subject of the ticket: ‘Korea code redemption issue’ to help the Player Support Team identify the subject of the issue. Player Support will be able to check in on the issue of the code not working within the League of Legends store.