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The male protagonist is a primitive Homo erectus who is full of curiosity. He likes to ask why and make little inventions. He accidentally made fire artificially and discovered the great role of fire. However, when he brought the fire back to the tribe, he was kicked out of the group with both himself and the fire because of the crowd's fear of the unknown. The male protagonist sets fire to the mountain to rekindle the fire, and meets an equally curious alien heroine who escapes from the fire. The two lived a prosperous life, inspired each other, and continued to innovate, lighting up the buds of the human technological tree. The good times didn't last long. In order to rescue the hero's tribe during the earthquake, they lost their fire. After that, the two of them searched hard and finally came to light again. However, fate plays tricks on people, and the outcome is unpredictable. Seven hundred thousand years later, Homo sapiens finally succeeded in passing on the legacy of scientific research from generation to generation.