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After graduating from high school, they went to study in different places. In college, they met different people and different things, and they were just passers-by, but their original hearts did not change. In a long-distance relationship, when you meet different people and different things, who gives you the warmth, who gives the warmth to whom, and who does the final warmth fall to?

Thousands of years later, with the development of science and technology, the environment has collapsed... In the face of external invasion and internal rebellion, where will human civilization go? ...