A sudden blizzard plunges the entire city into a freezing doomsday without heating. Gu Qing unloads her crisis-ridden basement, leads her family to move into a high-rise facing-sun room, and stockpiles a large amount of survival supplies in advance. As the cold wave strikes, greedy relatives, ungrateful exes, and desperate thugs successively covet the coal and food stored in her house, trying to seize them over and over again. Joining hands with heating technician Qin Chunxia, good friend Shen Suqin, and others, Gu Qing relies on housing advantages, homemade defensive equipment, and clever strategies to beat back invading enemies time and time again, guarding her family to survive with difficulty in the cruel extreme cold apocalypse.