Fat Man in a Strange World

In a strange world, a fat man who studied civil engineering traveled to a parallel world and acquired the system. How did the fat man grow into a boss step by step in the strange world and become a strong man that others envied. When encountering monsters and strange things blocking the road, the fat man spit out fireballs. Burn it to ashes, then curse and walk away. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.