public static void DeleteAll()
{
NMGPlayerPrefs.SetPlayerId(null);
NMGPlayerPrefs.SetDeviceKey(null);
NMGPlayerPrefs.SetRegion(null);
NMGPlayerPrefs.SetChannelKey(NMGChannel.EveryNetmarble, null);
NMGPlayerPrefs.SetChannelKey(NMGChannel.Facebook, null);
NMGPlayerPrefs.SetChannelKey(NMGChannel.Kakao, null);
NMGPlayerPrefs.SetChannelKey(NMGChannel.Google, null);
NMGPlayerPrefs.SetChannelKey(NMGChannel.GameCenter, null);
NMGPlayerPrefs.SetChannelKey(NMGChannel.Naver, null);
NMGPlayerPrefs.SetChannelKey(NMGChannel.Twitter, null);
NMGPlayerPrefs.SetCountryCode(null);
NMGPlayerPrefs.SetLanguage(null);
NMGPlayerPrefs.SetJoinedCountryCode(null);
NMGPlayerPrefs.SetIPAddress(null);
}