On August 18th at 6:30 pm KST, Just B held a V Live on their 50th day since debuting. A few days prior, they held voting for their fandom name. The choices were Only B, Flame, Besties, and Burning. The winning vote was Only B! 

The group revealed ONLY B means "The one and only beings who have a unique presence in each other's hearts." Do you like the name? Congrats to Just B and Only B!