Everyone Is Changing Their Jobs, but I Am Jobless but I Have a System

The Black Star disaster has struck, and the world has fallen into a crisis of annihilation. But in the crisis, it also left humans with a chance to survive, that is, everyone was given the opportunity to change jobs. But people have different fates, and most people have changed their jobs to non-combat occupations: chefs, farmers, repairmen, masseurs, and mothers. A very small number of people changed careers and became elite and rare professions: warriors, mages, healers, swordsmen, and gunmen. But the protagonist Wang Sheng, who traveled from the earth, did not get any job transfer... But he accidentally obtained a system plug-in that allows unlimited job changes. Everyone dreams of super rare professions: Tiangang Swordsman, Infinite Swordsman, Wandering Dharma God, Bloodthirsty Prince, and Void Fighter. The protagonist can change jobs at will. When others are still militiamen, the protagonist can control flying swords and kill people thousands of miles away. And the function of this system is not only this, it goes beyond that and even... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.