Reincarnation stories often feature a “memory gap.” The human lover has no idea who the zombie is. The zombie, however, remembers everything: the first kiss, the betrayal that caused the outbreak, the death scene.
Fast vs. slow, infectious vs. genetic, reversible vs. permanent. If zombies can be cured, past-life murders become negotiable. If not, every past death is a permanent tragedy. zombie sex and virus reincarnation final kan full