So the story went like this-
Jungkook had two aunts, one who was Hanbin's wife and other, Narin.
Kim Hanbin was a wealthy businessman till he cheated on his wife with her own sister and caused troubles. After his wife came to know, she was aggregated to be her true self and show dominance over the clan. She started her own Mafia clan and after that, Hanbin's clan was overtaken by his wife.
So in order to be powerful again, he needed to take over Jungkook's Mafia, since Jungkook's clan was stronger than his wife's.
Kim Taehyung aka V, however was adoptive son of Hanbin. He was sent out to keep a keen eye on Jungkook and his side by his father but in reality he was his adoptive mother's chess piece.
Jimin got contacted by Samuel and he was told everything about V and Narin. So he never did anything to V. 8t was a facade created by Kim Ji-na aka Dabria.
Meanwhile when I mentioned 'Mina', she was the biological daughter of Kim Hambin and his wife.
So if after this you don't understand, I don't know what to do to make you understand.
Thank you