Before the Apocalypse, Was I Turned into a Vaccine by Big Business?

This novel is a slow burn, with no omniscient perspective and no harem. It's not the usual power fantasy; it gradually gets better as you read. It won't be too long, so I recommend giving it a chance. The deeper you get, the grander the world becomes! Liu Mingfu once dreamed of a world free of disease, but he was cruelly exploited by capital and used as a human vaccine, enduring inhuman suffering himself. His tall, handsome assistant turns out to be a foreign agent who stole the vaccine, and even the hostess he once sponsored is rallying a crew to hunt him down? A world overrun by zombies and a nuclear war eventually draw an alien invasion. In the end, I unravel the mystery between Linhe Star and Earth and prevent the collapse of the entire universe. The apocalypse began because of me, but I'm also the one who will save it!