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Type: rebirth in the apocalypse, zombies, hard-core survival, dark flow, no virgin, decisive killing, single-player invincibility Character of the male protagonist: completely dark, ruthless, extremely self-interested, does not trust anyone, will die if he saves others, and will kill anyone who hinders him Style: No warmth, no love, no whitewashing of humanity, everyone is selfish, the human heart is scarier than zombies