Even Immortals Have Their Own World

What does it matter if I'm just a nobody from the modern city who stumbled into the thick of things? I can still rub shoulders with immortals and make a name for myself! My master doesn't like me? Who cares! He can't get by without me, because I'm the only one who can pull out that deadly sword! Those mythical beasts and magical treasures? I'll gladly take them off your hands! In the world of immortals, you don't always get to choose your own path!