I think, it's not about the game, but it is my computer's problem, or maybe some problems with my connection(not speed), i tried to log in to other Ragnarok private server that i had, and the same problem applies, it does connect, but when i enter, i got disconnected or just freezes on the game, even i wait for it, nothing happens and i just have to close it.
Edited:
i just tested it with our other computer, that i don't use in gaming, and i confirmed it that it was basically my computer's problem. i don't know how to fix it. but basically, it only affects my ragnarok client.
if you have any remedy about these problems, kindly tell me. thanks