The Path of Ghosts Leads to an Emperor's Reign

When people die, they become ghosts; when ghosts die, they become jian; when jian die, they become xi; when xi die, they become yi. What kind of grievance could those resentful spirits and vengeful ghosts, dead because of mere human passions and desires, possibly hold in their hearts? What I feel is the mercilessness of the universe after it has betrayed me.