In fact, I don't really like novels in which the male protagonist travels through many worlds to save different female protagonists. It's not 1V1. It seems that women can only wait to be rescued.
This book is also the same. The heroine is not fixed, and she is basically a character "waiting to be rescued".
But from another perspective, if you read this book as a non-CP, you will really like it - the biggest attraction is that the male protagonist is a real dog, and he can turn himself into a white lotus in the prosperous world every time even if it starts in hell, and he can also make the villain so miserable that he cannot tell anyone.