The Great Escape from the End of the World

He is an apocalyptic slave with no name code 369. His daily job is to herd iron cows and iron sheep, and search for iron ore to feed iron roosters in the ruins. Until one day he found a blue stone in the ruins. His heart started beating, and the super praise system was activated. At the beginning, he praised a tree to death, and the people behind him began to chase him crazily...