In novel hero enters tent in the moment of interracial intercourse and i don't remember anything about elf shouting about sword. I think manhwa deviate from novel to fit in to age rating. In general manga is good so let it slip.
When i readed first chapter i spitting at how stupid it is. But in later chapters i find it quite interesting, even if i don't understand 90% of that finance stuff. It feels more realistic and fresh then most of generic reincarnators.