Ice Age: I Am Five Hundred Years Ahead of Technology

There was a global blizzard, and the world cracked into a frost purgatory. "Withered flowers" bloomed under the snow, dyeing corpses into mysterious things, and devouring warmth like crazy; living people swallowed flowers to gain supernatural powers, but their bones were replaced and their souls were eaten away. The major factions are ruthlessly separatist, and human relations have collapsed. Li Hao brought the only copy of science and technology from five hundred years later and set up a glimmer of light on the ice field. Flowers want humanity, he wants people's hearts - if there is no heater in the world, then use the blood of the enemy to boil the coordinates of returning home.