Blood-Feeding Gold Ants: I Have a Metal Mine in Disaster Years

The protagonist is a screwdriver in a factory in modern times. His soul has traveled to the body of a man with the same name in an imaginary dynasty. At the same time, he is bound to the gold-eating ant upgrade system. As long as the ant is upgraded, it can have the energy to discharge metals, from iron to gold and silver. Let's see how the protagonist uses this system to rise from a poor boy who can't even eat to the top step by step.