After I Died, I Became the Little Maid of Emperor Hades

I was attacked just after I died, but I was rescued and taken in by Emperor Hades, and became his little maid. Because I have no memory of my death and the cause of death is unknown, I cannot be resurrected or reincarnated. In order to be resurrected and return to the human world, I agree to three conditions of Emperor Hades. Later I met a ghost doll bigger than a palm. Emperor Hades gave me the opportunity to go to the human world to experience. Xiaowanzi and I caught ghosts in the human world. Holding on, the truth gradually emerges. And the cause of my death is about to be revealed... But Xiaowanzi disappeared...