Six months pregnant, Xia He receives a warning from her unborn baby's spirit, Nuonuo, about an impending apocalypse caused by torrential rains. Her scumbag husband, Lu Chengyu, brings Wen Ruoxi to their home and demands that Xia He hand over her child-rearing fund to pay off his debts. Pretending to give them the money, Xia He secretly transfers the entire sum away and begins frantically stockpiling survival supplies. She transforms her self-built mountaintop house into a secure fortress. When the apocalyptic rains arrive, Lu Chengyu and Wen Ruoxi incite the villagers to attack her stronghold and even hold her pet dog hostage to threaten her. Using an electric fence and clever broadcasts, Xia He drives back the attackers and turns the villagers against the two troublemakers, who eventually perish in the floodwaters. As extreme cold and mutated creatures emerge in the aftermath, Xia He helps fellow survivors, forms alliances to establish a settlement, reclaims farmland, grows crops, provides medical care, and builds a stronger community capable of protecting itself.