The file is in the System folder, it is "Towninfo.lua", simply comment out the npc coordinates. if they show up in Korean it is because this file is not translated. I have a translated file if you want it, or if you prefer you can comment out the coordinates or just erase everything in the file. Comment out like so:
prontera = {
-- { name = "Kafra Employee", X = 146, Y = 89, TYPE = 6 },
-- { name = "Kafra Employee", X = 151, Y = 29, TYPE = 6 },
-- { name = "Kafra Employee", X = 282, Y = 200, TYPE = 6 },
-- { name = "Kafra Employee", X = 29, Y = 207, TYPE = 6 },
-- { name = "Kafra Employee", X = 152, Y = 326, TYPE = 6 },
-- { name = "Guide", X = 154, Y = 187, TYPE = 4 },
-- { name = "Guide", X = 282, Y = 208, TYPE = 4 },
-- { name = "Guide", X = 29, Y = 200, TYPE = 4 },
-- { name = "Guide", X = 160, Y = 29, TYPE = 4 },
-- { name = "Guide", X = 151, Y = 330, TYPE = 4 },
-- { name = "Tool Dealer", X = 134, Y = 221, TYPE = 0 },
-- { name = "Weapon Shop", X = 175, Y = 220, TYPE = 1 },
-- { name = "Blacksmith", X = 179, Y = 184, TYPE = 3 },
-- { name = "Inn", X = 204, Y = 191, TYPE = 5 },
-- { name = "Inn", X = 107, Y = 218, TYPE = 5 }
},
Incidentally... I've started using this for my own custom NPCs.