Board Thread:General Discussion/@comment-27907368-20160412010659/@comment-26887879-20160508123331

But, still it was never said if he met or didn't met any of the previous humans. It also might be that he's a scientist and due to his research/studies he knows how to tell Monster and Human apart, but that's just a speculation, too. Unless it gets explained somehow in the future, there's no possible way of knowing for sure...