End of the World: Investment Goddess, I have a 10,000-fold return system

[Rebirth + Doomsday + System + 10,000-fold Return + Harem + Cao Ze + Decisive Killing]
In his previous life, Meng Fan knelt down to lick his wife's family, but was dismembered and turned into bait for fishing monsters
Reborn one month before the doomsday, Meng Fan obtained the Goddess' 10,000-fold Return System. As long as he completed the task, he could get a lot of resources and various rewards. From then on, he embarked on the road of a cold and murderous doomsday hero.
Stock up supplies, build a top-level shelter, and become the doomsday overlord.
Search for goddesses, and don't let go of any woman you like.
Decisive killing, incarnation of the doomsday master, let all the enemies who persecuted him feel the deepest and most painful despair.
In this life, resources, beauties, power, status... I want them all!