I Cultivated for Three Years, and Everyone Outside Practices Martial Arts?

Three years ago, Master Long saved Duan Fei from the jaws of a dog demon. His master told him the world outside was full of man-eating monsters: Godzilla, xenomorphs, and even Chu Renmei! Duan Fei cultivated immortality for three years and had just broken through to the Golden Core stage. Then the Academy of Supernatural Abilities came knocking. Was the master who had led him up the mountain to cultivate immortality actually the academy’s dean? As he left the mountain, the System told him to kill a first-tier minor demon and even gave him the [Xuanyuan Sword?] The missions that followed grew more and more outrageous, and the rewards turned into [Mending Heaven Stones], [Five Elements Thunder Arts], and even a [Plasma Spark Tower]. Duan Fei’s attitude gradually began to change. Day one: No one below the Mahayana stage gets to show off. Day two: No one below the Tribulation Transcendence stage gets to show off. Day three: Maybe I can show off just a little? Day four: I’m a Golden Core cultivator. What are you?