Who Put the Artifact in My Warehouse?

One inconspicuous day, Xu Qing saw his body on the news... From that day on, he entered the world where all the people who died unexpectedly lived, and began endless killing, weirdness, and deception. A few years later, when he walked out of this world on a mountain of corpses and a sea of blood, he discovered that the person who designed all of this had never left his sight... (Slaughter City setting) It doesn't matter if you haven't seen the original work.