Copy Mortals into Saints

Zhang Yan was reborn in the past, where mountains and rivers were shattered, civilization collapsed, inheritance was broken, order was chaotic, the environment was harsh, the population dropped sharply, and the situation was precarious. The earth is no longer what he remembered. It is full of dangers, people's hearts are sinister, and the advantage of rebirth is no longer there. Zhang Yan, who comes from a civilized society, lives in a refugee area. He relies on a system that allows you to copy other people's skills if you have money, and rises step by step from the refugee area!