10 years ago, after “the Gate” that connected the real world with the monster world open...
THE OP MC MANWHA. Read this one years ago, and I've reread multiple times since. I don't know what it is about this one, but it just hits in all of the right ways. I do think it's insane how much the main character changes in appearance from the start of the manwha, but that's a small gripe to how good this one is.