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When we first met, she was a skilled backpacker. When we met again, she was a heroic army instructor. Later we found out that she was the captain of the most mysterious team in the army, the team most admired by all soldiers. When we first met, he was a frail prisoner. When we met again, he was a military doctor in the army. Later we found out that he was a scientific researcher protected by the army and had excellent medical skills. They were two people who had never crossed paths, but they did meet again and again in missions. He fell in love with her at first sight, but she felt nothing for him. He cast a big net and slowly captured her heart. However, they finally got together. A disaster came from the sky, and the black holes in the universe exploded and merged, causing the planets to collide and merge. All living things mutated. Where should humans go? How should we solve this disaster? Should we choose the crisis of family and country or the love of children?