Hey, is there a free trial or something like it for this service? I’d like to start using it for FFXIV but i’m not sure what kind of impact it’ll have on my gameplay.
Yes. If you verified your e-mail, then you will receive 10 KRW to your account, equivalent to 0.07GB traffic.
When I checked your account, it seems you already have a trial credit. 
Please test with it first and let me know if its credit isn’t enough to test all features of Mudfish.