On the day when the earth was diagnosed as a "living planet" and human civilization was diagnosed as proliferating cancer cells, the end of the world came in a way never imagined. It wasn't meteorites or nuclear war, but the Earth's own immune system that started the global cleanup process. Lin Mo, an ordinary urban office worker, unexpectedly discovered on the tenth day after the purge program was launched that he could hear the conversations of "immune cells" and even give them simple instructions. And the APP on his phone called "Planet Health" that couldn't be deleted began to pop up a countdown: There are still 72 hours until the immune system attacks.
