Hmmm.. I suspected this when I saw it was only her grandmother.. Her brother and parents died ?  Which really explains her personalty is described as shy, emotionaless and  no friends type.  Now the MCs moving in like a wolf on her, I just hope the MC treats her well.......  her saying fated one, makes it seem she thinks hes a guy to bring her happiness ? Even tho manipulated into it, it could help yet ?.  but I cant expect much :/ I just hope he gets this right and she comes out better ?.  Saving a girl, even tho its underhanded means, would make it "at least" feel something good came from it.