Additional Services' Researcher Hermin:
In order to change a class, several conditions must be met. Changing a class requires care and attention, so it is only done in this laboratory.
First, you need Class Change Coupon, that's sold in the Adena store section of the L-Coin Store.
Second, you have to unequip all items.
Third, you need to free up your inventory You will need at least 30 slots.
You should also know that only warriors can change classes, not holding the title of Hero.
So, are you ready?
Application for class change