For people that don't know the backstory you can read more about it here. TL:DR version: B-Free disses Rap Monster and Suga at an event in 2013 and angry BTS fans attack him. Things have been relatively quiet since then until old wounds were re-opened when B-Free apologized for his actions just a few days ago. Even after posting his apology, he has been constantly attacked by BTS fans and it appears he has had enough.
B-Free posted that he would bitch slap BTS the next time he sees them and said, "I swear bts got some retarded ass fans."
Wow, those are some strong words. He has a song titled "Hot Summer" but it appears it's going to be a Hot Winter as things are heating up.
You are never gonna get chance to see them