SPOILER:
She’s the princess, they faked engagement so that he could continue to secretly search for Paula & she would be able to get people demanding marriage of her off her back. The mansion they’re in is just a place for her to chill w/o any eyes & for him to secretly search for Paula - Que the werid appearance demands from recruiting the servants. The blond lady is helping him search.

i still cannot believe he doesn't recognize her from voice alone. i know she described her appearance differently, but i would've expected a "your voice reminds me of someone" by now at minimum.
like she was the only one by his side for so long, would read him stories, comforted him etc. and you're telling me, the formerly BLIND man. the man who had to heighten his other senses (like hearing) because he was blind, can't recognize her voice?? not even a tad bit???