Well, I guess a demon lord type antagonist that acts like an actual demon lord isn't bad once in a while. Obviously bad for the people he unreasonably killed, but besides in-universe characters.
Yeah, this female lead is pretty dumb, but I doubt she doesn't realize here. The smell of blood alone would be really strong. Not to mention she's tentatively a martial artist with this cultivation nonsense going on, so her senses should be even sharper.
I wonder if Su Luxia is planning to go with the "kidnapping" narrative or if she'll expose their little relationship and drive reality into it hardcore?