Here are the details from the official site.
Welcome to Netgame!
We are currently looking for Hero Online closed beta participants and we look forward to seeing you in your dynamic adventures in the world of the Martial Arts!
So here are the details regarding this event :
Closed Beta launches on June 15, 2006 (11:00 AM U.S. Pacific Time GMT -8:00)
2. How to participate in Closed Beta
Step 1. Receive a digital key from one of the following partners:
Step 2. Create an Account HERE
Step 3. Activate the digital key HERE
1. There might be some difficulties in the registration process if you use an internet browser other than 'Internet Explorer'.
2. The official closed beta website and the game client will be available on June 12th, 2006
3. If you have registered for 'The Legend of Ares', you may use the same Account information for 'Hero Online'. However, a digital key will be required in order to participate in the Closed Beta.
We are currently in the process of preparation to provide the best service to you in the best martial art action MMORPG! Please check our announcements frequently for upcoming updates!