Before the extreme cold doom descends, Wen Qing returns to thirty days before the disaster erupts. Seeing through the true faces of her selfish younger sister Wen Xin and her boyfriend, she decisively cuts off ties, sells her property, and retreats with her parents to a deep mountain ancestral home. She modifies an air-raid cellar, hoards massive supplies, and builds multiple defenses. As extreme cold, floods, and famine strike one after another, she relies on her advance preparation to fend off refugees and bandits, rescues the mute orphan Xiao Shitou, clears land to farm, taps underground water sources, protects her family in the wasteland fortress, survives layers of doomsday desperate situations, and guards a peaceful vitality.