A World of Survival

When dusk sinks into the ground with the remaining sun, and the full moon dominates the night sky, the hope of the world will come. In the dark night, humans will light fire to drive away the darkness. So if the world falls into doomsday, where can all sentient beings get hope? ! There is no time travel, light Cthulhu, or Western fantasy parallel world. The core of the story is purely fictional without any bad guidance.