I don't want to nitpick however, the first page is clearly mean, guest instead of customer if you understood the situation there.
Either way, thanks for doing it man.
I mean, if he can go back to his world, why not bring you, his wife with him? Just in case he might lose his power when he return, make sure to disguise or turn his wife into a normal-looking human if possible.
Duh, he can literally access to the magic system, nothing is impossible.
As for those who didn't read the novel and thought this is harem manhwua, No.
I have read the novel till the end and I can assure you of that.
He ended up with a girl and as to who is it, I leave it to your guess.
@Tahaku, my guess is, that skeleton is the current body that the MC is occupying which he assumed to be his game character. After all, the dragon did say his a monster, right? And also, his real body is still in another world.