I Changed My Job at the End of the World, and I Stole the Opportunity of the Protagonist

[Doomsday] + [Professional change] + [No system] + [No fixed heroine] + [Not the Holy Mother] The end of the world has come, demons have invaded, and everyone has changed jobs and become survivors. In this most cruel battlefield, only strength is the greatest truth, and profession and skills are the greatest reliance. Fang Yu, an ordinary person, just wanted to survive in the apocalypse, until he met someone by chance...