Tree of Savior started open beta in South Korea early this month but it seemed that it had a trouble recently. Several posts at ToS' Reddit page indicated that Korean players were not happy about the new cash shop items, specifically the EXP books.
Since ToS is highly replying on grinding to progress and the grinding is not easy, selling EXP at cash shop likely bread P2W. The image below was taken today as the demonstration was happening in the KR server.
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And this image below gives you a glance at the cash shop.
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Players use TP (Tree of Savior Points) to make purchase in the cash shop. TP accumulates over time or can be purchased with real money.
* TP accumulation: once your TP is less than 5 you'll gain 1 TP every 2 hours whether you're online or offline (but if you are offline your TP will recover up to 5)
Players aren't able to purchase TP with real money until commercial launch so they can only get free TP everyday. Apparently the protest is also aiming at the potential game balance breaking model in the future.
Source: Reddit
Since ToS is highly replying on grinding to progress and the grinding is not easy, selling EXP at cash shop likely bread P2W. The image below was taken today as the demonstration was happening in the KR server.

And this image below gives you a glance at the cash shop.

Players use TP (Tree of Savior Points) to make purchase in the cash shop. TP accumulates over time or can be purchased with real money.
* TP accumulation: once your TP is less than 5 you'll gain 1 TP every 2 hours whether you're online or offline (but if you are offline your TP will recover up to 5)
Players aren't able to purchase TP with real money until commercial launch so they can only get free TP everyday. Apparently the protest is also aiming at the potential game balance breaking model in the future.
Source: Reddit