Maybe because im obsessed but..

I love this type of world building, reminded me of "that time i got reincarnated as a slime" it was my obsession lately so i keep trying to find the similarities haha, the only thing that I'm complaining is the rushed introduction and weird development between the demon king and the og mc, but maybe so we dont get attach and we can move on to the main stories, anyway are there any manhwa/manga that is similiar to this pleasee