Tree of Savior, as the colorful fantasy title will begin its Korean closed beta. If you have questions about the beta test, MMO Culture posted a short interview that covers several of the details.
The team's primary goal during the first closed beta test is to ascertain "development direction in the future." This will be done by letting gamers check out features like the circle ranking system, companions, and 28 playable classes. A post-beta wipe is confirmed as well.
However, as 90,000 people have registered for Tree of Savior's test and only 3,000 of those will be admitted, the chances are not great that you can hop into the beta... at least for right now.