@Hell_Satan pretty much what I said o.o. Many Chinese, Korean, and Japanese stories does that. Yes, most Chinese books tend to do that but let's be honest; other Asian books do the same.
I just like how this time in a way to rectify ,cuz the god of the underworld is forcing him to, the loopholes the author made are corrected after taking over the role of a very minor character that only makes a few appearance in the story. It is like having an editor of the actual plot. There are times that you will need to erase and make another sentence/paragraph to send the message in a more appropriate way. I hope he won't get anymore girls. I am - ok- with the slave having a crushed in the villain/author since he saved her and will forever be in debt. But, I don't want to see a harem in this story because it will add unnecessary drama and problems to the now new MC.