The End of the World: I Asked You to Fight Zombies, but Have You Trained Them All?

As soon as he opened his eyes, Qin Yu was reborn five minutes before the end of the world. Different from his previous life, this time he was no longer an unlucky guy who started to "hang up". With the addition of the "Doomsday Furnace" system, he only needs to refine zombies to receive rewards, improve his level, and increase his overall attributes! "Refining first-level zombies, gaining experience +1 and strength +1!" "Refining the first-level licker, gaining experience +2 and strength +2!" "Refining the second-level corpse king, gaining experience +5, and dropping: Physical Enhancement Mixture*1!" So Qin Yu just went on the road of "refining corpses" and never returned...