It can be the problem of ExternalSettings file "..\data\luafiles514\lua files\service_korea\externalsettings_kr.lub". You should check it in this file:
Since versions "2017-05-02aRagexe" and "2017-04-19bRagexeRE" there is no need to modify the code of EXE. These EXEs support the new network packet 0xABE. I will check the code of the latest rAthena after arriving at home.