I'm Still Alive Because of Global Mutation, but I Still Got My Wife for Nothing?

A nuclear war breaks out in human civilization in the future world, and a nuclear explosion destroys a secret biological experimental base. The base was severely destroyed, and an unknown virus was leaked from within. This virus can mutate humans and animals and make them very aggressive, mutating most of the life on earth. Coupled with the continuous nuclear strikes, only a little bit of human civilization remained... Liu Lei built a base before the war broke out, which could withstand nuclear explosions and mutant attacks, so Liu Lei lived very comfortably during that time. Liu Lei saved a young and beautiful girl during an expedition, she was Li Jing. Li Jing is not only beautiful, but also considerate and has a special affection for Liu Lei. Later, Liu Lei and the others discovered a mysterious organization and explored many cities and countries...