Currently, Hyper Universe Early Access is only available through Steam at this time. You will not be able to log in via the Nexon Launcher.
In order to play, you must have redeemed a Steam Founders Key on your Steam account. If you did not receive a key from playing in Beta/Alpha, you will need to purchase a key!
You can purchase a Founders key and access to our Early Access here: http://store.steampowered.com/app/591530/Hyper_Universe/