I resolved server connection but there's an error of login on the client.
I looked around the KGC Client EP1 in this forum and used 'GrandChaseSeasonVKGC.rar' and 'GCAsia.rar'. However, Xtrap made the login stopped. So, I used main_DP.exe which removes Xtrap but original main.exe is different from main_DP.exe in the sense of size of file. In conclusion, that will not work.
I also tried the latest KGC and typed ID and password but it said that '인증 오류 10번'.
Can I get main.exe removed Xtrap for KGC Client EP1?