Extreme cold, frozen apocalypse + reborn + spatial storage + clone ability + System + evolving supernatural powers + stockpiling supplies + laying low + survival base + decisive and ruthless
With an apocalypse this dangerous, of course you should keep your head down until you reach a safe shelter. The protagonist awakens spatial and clone abilities.
His clone shares a space with his original self and can venture out to gather supplies in the apocalypse. It can also pass the skills it learns back to the original, continually strengthening the protagonist's powers.
After being betrayed by his girlfriend, the protagonist unexpectedly returns to three months before the apocalypse. Using his knowledge of the future, he builds a sturdy shelter in advance and stockpiles supplies nonstop.
When the apocalypse descends once more, fewer than one in ten people around the world survive, and human morality and civilization vanish completely.
The age of survival of the fittest returns, where the weak are eliminated and the strong prey on the weak.
"Have you gone crazy? The neighbors are killing each other over a packet of instant noodles, and you're over here eating hot pot and singing?"
