Dear, thank you for your message of asking. Due to the player's same-old-character-binding behavior, this event have been optimized and re-opened now.
And please kindly know that you can still bind your old friends since the repeating binding relation have been cleared. And for those who have claimed and exchanged successfully in game, they cannot exchange again for the same reward. Hoping for your understanding and please enjoy the refreshed event~
For more detail, please kindly have a visit:
http://goo.gl/tZsd1p
Thank you for your participating!