Doomsday: More Children, More Blessings, and Trips to Ancient Times for Supplies

From a nobody to a big shot, one step at a time. A doomsday safehouse? No need. Anywhere I, Li Haoyu, am is a safehouse! Being reborn to stockpile supplies? Impossible. There aren't that many ways to undo your regrets in life! Bring on all the treasures from ancient times and the apocalypse! [Apocalypse + Transmigration + No Goody-Two-Shoes + Many Beauties + Fantasy + Pocket Dimension + Conquest + Alternate History] Li Haoyu is a programmer on Blue Star. From the start, he gets laid off and dumped by his girlfriend. By chance, he obtains the Apocalypse Reproduction System, which requires him to save the civilizations of two planets. [The two planets have complementary resources] [Blue Star] A modern civilized world where the protagonist lives, in the age of firearms and advanced technology. When the apocalypse hits, zombies run rampant, and the soil and water become polluted, making the planet unfit for human life. [Green Star] A world with an ancient civilization in the age of cold weapons, where people are mired in ignorance. Its nations are locked in constant warfare, the human population is rapidly dwindling, and barbarian invaders are on the way. To ensure the survival of human civilization, the protagonist must father as many children as possible to earn System rewards, level up by fighting monsters, and preserve human civilization on Blue Star and Green Star.