In the extreme cold doomsday, Lin Han, who died tragically, unexpectedly is reborn seven days before the disaster and binds with the "safehouse upgrade system." Relying on memories of the previous life, he crazily hoards supplies and modifies his residence. After the cold wave arrives, he shelters survivors, establishes rules, competes for energy cores, and gradually upgrades a safehouse into a regional survival base. Facing internal conflicts, resource crises, Black Hawk forces, and a minus eighty degrees cold wave, he grows from just wanting to survive alone into a base leader guarding everyone. At the end of the first volume, a new "frozen core" appears, and Lin Han decides to find the true origin of the doomsday.