Selling a Dynasty to Save the Future

After experiencing a gruesome death in the blizzard apocalypse that had transpired in her previous life,Wendy Levine has been reborn to the timeframe that's set 30 days before the start of the apocalypse.But this plot is different from the usual ""superpower"" or ""possessing a spatial ability"" trope. The Levines have gotten reborn together, with the exception of Jenny Levine, the traitorous younger sister. Not to mention, they don't have any physics-defying abilities that can help them out.Armed with just the knowledge of their past lives, the Levines sell all of their assets decisively in exchange for tens of millions of dollars in cash. Then, they use the patriarch, Alex Levine's knowledge in engineering to build a top-tier apocalyptic bunker that obeys the laws of physics.