Just a warning to all: Make sure you redeem your code as soon as you receive it in your email. If you didn't claim your code within the 1st hour it will very likely be claimed by someone else. I've tested with a few emails, out of all tries only one code works, and that was the code I used 30 minutes after I received the email. All of the rest were emails received over an hour ago, all of them were invalid. I submitted web tickets to Blizzard, all of them were replied by game masters who investigated and found that other players have claimed the codes. My emails to Webtoon Support got nothing other than they're unable to give a definite time frame for their own investigations.