Update 2:30 PM PST:
This issue looks to be resolved as of 1/18/2020 2:30 PM PST. Please try logging in again. If you are still having trouble accessing the game or launcher, let us know by creating a ticket. Thank you!
We are currently investigating reports of connection issues to Nexon accounts through the Nexon Launcher and game websites, as well as Steam. This may cause interruption for some account services, such as receiving account verification emails. We apologize for the disruption this causes and are working to resolve the issue as quickly as possible. Your patience is greatly appreciated.