Transmigrated to the Seventies: The Fake Heiress Is a Research Genius

Shen Duyun was killed by a mutant in the apocalypse and transmigrated to China in the 1970s, an era when you needed ration coupons to buy everything. Her original self was hopelessly lovestruck and overly generous, so Shen Duyun sent the scumbag and his cousin to join the original owner in the afterlife. She happened to fix a car, drawing the military's attention, and then happened to see a computer, prompting a research institute to beg her to join.