Isn't This a Magical World? What the Heck Is a Cultivation System?

Sixteen years ago, Shi En, a well-known corporate wage slave on Earth, unexpectedly dropped dead at his workstation. After death, he was reborn in another world. The good news: magic exists in this world, and he has a talent for it. The not-so-good news: as a transmigrator, he seems to have missed out on the legendary golden finger. As it turned out, Shi En had misjudged the authors on Qidian. After living an ordinary life for sixteen years, he finally awakened a System during a life-or-death expedition! But... wasn't I transmigrated into a world of swords and magic? What the heck is a cultivation System? Did the channels get crossed or something? He thought it was a useless System, but cultivation and magic unexpectedly sparked something extraordinary when they collided. They're both Fireball spells, but compared to Shi En's, everyone else's fireballs look like little girls. Shi En suspects that the magic in this world is counterfeit, and the cultivation techniques from the System are the genuine article...