From beta:
Inventory expansion item is on store, but when you buy it for silk it will be unusable because already 3 pages unlocked (wasted silk).
Adding Devil Spirit magicstone for the second time to Devil spirit will DC you and you will lose the stone. How many times are you supposed to be able to use it?
Reverse return from Premium can be used without cooldown.
Party mobs spawn even when nobody in 8man party is in range. Doesn't work like that in other servers, so idk if bug or intentional.
Monster spawn rates are too low. Please consider increasing, for release day at least, because there will be many "people", with nothing to attack.