Cleaning up Old Time and Space

What is the cost of traveling through time? Die. Roy spends his days cleaning up the messes of these unfortunates who have been torn to pieces. As a nominal "outsourced employee" of the church, his daily routine consists of hunting monsters in different centuries, recycling cores, and complaining about the stingy boss who talks in his head at any time. I thought this was just an ordinary overtime job - two monsters, two cores, and ten years' salary. Until he bumps into a ghost trying to escape back to 2024 in the fire scene. Roy told the scientist who had already died once: You don't want to go back. Because there is something waiting deep in the space-time channel. It has seen us.