Update (2:30 PM PST): The login error has been resolved. Thank you for your patience, and enjoy MapleStory!
We are currently experiencing an error where Accounts are unable to login to Nexon games through the Nexon Launcher, Steam, and Nexon Game Websites. We are working to determine the cause of the issue and will update you when we have more information of the situation.
Thank you for your patience and understanding.