Orphan Lin Feng accidentally awakened to the "Doomsday Fortress System" and predicted that a global extreme cold disaster would come one month later. Relying on the system's lottery and shopping mall functions, he spent all his money to secretly build an indestructible underground safe house on the edge of the city. The extreme cold arrives as expected, civilization freezes, and order collapses. Lin Feng, equipped with a universal exoskeleton armor, rescued Su Qing, a doctor of biology, who was dying when he went out to collect supplies. The two depended on each other in an isolated underground fortress, from strangers and wary to gradually falling in love, and finally became husband and wife. Faced with the severe cold outside, mutated creatures, unpredictable survivors, and the challenges of internal resource management and emotional integration, they worked together to build a cold safe house into a warm home and a beacon of hope in the apocalypse.
