Yes, you need to have the charakter created in KR so you get to do the New Player Quest which is only available that way in KR.
You have to do some stuff and after that, you get to talk to the big black guy.
He then tells you, that you are way too bad to fight now and that you should come back when you´re trained well.
(But you dont really need high skills to kill him)
You get the rune so that you will be able to return there to fight for the Rewards. Which would be Skill tutor statuette, Ring of the Servant and Echo staff.
The rune is worth nothing. I myself got like 10 of those.
I dont know tho if the katana you get in the beginning would be worth anything.
I doubt it, maybe like 50k if someone was intersted...
Take Care and Happy New Year
Vaneca