Can't remember the name

I remember reading about a female that accidentally witness a murder(?) scene in a car and got stopped by those murderers and one of the murderer is the supposedly (?) ML. She manage to ran away with her car but then the man stalks(?) her and because of some sort reason she become his sex slave (?) but then the girl notices that the ML fell in love with her a little bit and she wants to make use of this to make ML let go what he blackmailed(?) her with and also make him regret doing this to her