The End of the World: the More Girls There Are, the Stronger the Protagonist Is

"The end of the world + system + super powers + obscene development + many beauties + decisive killing" The apocalypse is coming, zombies and mutated animals are everywhere, and everyone is struggling to survive. Some people fight against each other for supplies, and some people are at war with each other. Others are a blessing in disguise and have awakened their superpowers and become human masters in the apocalypse. But Chen Chuncai is an anomaly. At the age of sixty-six, he obtained the system in the end of the world. The more girls he has, the younger he will be, and he will also gain unique abilities...