Tree of Savior is a free massively multiplayer online role playing game developed by IMC Games. The game was made by Kim Hakkyu, creator of Ragnarok Online. It is based on traditional Lithuanian culture and mythology.
On 28th April, the developers are planning to open the game for public. However, you can start playing today if you are one of the owners of Founder's Pack. The official announcement and more detailed information can be found here.
However there are quite a lot of issues regarding servers because there are no regional servers worldwide. It means quite a high ping for gamers in Western countries. And from what you can see on Steam forum, there are around 30.000 people online. Long waiting queues and bugs not being able to get into the game. Hopefully they will fix it soon.
And if you make a rough estimation that around 60.000 pieces could be sold for 10 euros then you get to around 200k euros profit through Steam. Which is not bad, not at all... For the first day.