I'm Collecting Corpses in the Demon Slayer Division

I was collecting corpses in the Demon Slaying Department, and the first corpse I collected was myself. Xu Ping'an is just the most inconspicuous corpse collector in the crematorium. He burns monster corpses during the day and collects dead people at night. There are only three rules: don't look too much, don't ask too many questions, and don't talk too much. Until that night, he opened the white cloth and saw a corpse with the same name and appearance as himself. The corpse opened its eyes and said to him: "Don't burn me. If you burn me, you will really die." From that day on, Xu Pingan realized that the Demon Slayer Division was not slaying demons, but erasing their names. The dead tell the truth, the living only lie. Behind every corpse sent to the crematorium, there is a case that should not be known. He can hear the last words of the dead, and can also borrow the dead's strongest skill before death.