Everyone says Su Tang has gone crazy. She believes a warning that no one else can see, mortgages her house and liquidates all her assets, all to build a doomsday shelter. Her husband thinks she's being unreasonable, her daughter is ashamed of her, and even her parents cut ties with her. Despite being ridiculed by the entire world, she chooses to stand firm on her own. Then the city is swallowed by ice and snow. The shelter that was once considered insane becomes the only lifeline for her entire family. Just as everyone begins to regret their actions, Su Tang discovers that the real danger isn't the cold wave, but human nature.