Who is Brianna O'Conner really? well let me tell you she is an Angel, well a Charlie's Angel to be precise a job that nobody knows about she goes by Bri or Brian though but she had to work with the police they didn't know she was an Angel. She really wasn't a Narc on the Toretto's as she was going to get somebody else as an Angel. Brian started to catch feelings for Dom before she knew it she was in a relationship with the guy, She told Mia she was a cop to save Dom and his friends and used her Police name. When the Toretto's went on the run they left behind Brian who was used to the feeling of being abandoned. She finished her real mission and got a new mission, she got a group and has tried to forget about Dom but he never really leaves her mind. Will she ever see him again or will they lose each other forever. She saved Jesse which she happily got shot for as the kid deserved better. Letty and Dom are having an on off relationship right now as he can't stop thinking about Brian.
Brian will be a bot more serious than Sabina.
Female Brian O'Conner as Sabina from Charlies Angels (2019)
Brian x Dom.
The Toretto's will learn the truth of Brian.