A Mystic Master Cultivates, Farms, Takes Disciples, and Saves the World

[All-rounder + System + taking disciples + no romance] All I wanted was to quietly make a living as a fortune-teller, but somehow I ended up with a disciple-taking System. Changes in the magnetic field caused two worlds to overlap, and all kinds of man-eating monsters and demons started pouring in. There's no helping it. The greater your abilities, the greater your responsibility. I can only take on disciples like crazy and do my part to keep the world at peace. [Modern era - ancient era - modern era]