To celebrate reaching the 10,000 member milestone on their fancafe, the members of HALO courageously stood on top of a bungee jump tower to keep their promise to fans. 

OOON stated in the video, "Lets not think of this as a pledge for 10,000 members, but as us keeping our promise to our fans. And we're going to continue reaching up to 20,000~30,000 members!"