How did cây ô rô, hoa huệ, holly J and Fiona become friends?

cây ô rô, hoa huệ, holly j started liking Fionas brother and they dated. After that, they became Những người bạn and cây ô rô, hoa huệ, holly j got close to fiona because she was rich. even through betrayal, deception, and drama, they forgave and remained friends.