In her previous life, her soul had been incomplete, missing a rather large piece, and it was only when her true self arrived in this world that she became whole.
As for the incompleteness Hei Luoluo had mentioned, that was a seal placed on her by someone—if she were to be caught, wouldn't that just make staying alive that much harder?
As for the mystery of her birth, she would just have to look into it herself after Meng Luoluo ascended to the Upper Realm; the more she said, the more mistakes she would make, so Hei Luoluo could only speak vaguely about having her mouth sealed.
Chapter 142