People Are in the Last Days and Are Locked up in a Dark Room at the Beginning

In order to compete for the outer black armor, all parties in the world did not hesitate to launch a nuclear war. As a result, almost 99% of the world's human beings and 70% of the land were destroyed in the nuclear explosion, followed by various monsters transformed by radiation... In this chaotic era, let's see how Li Chongguang got off to a bleak start as a prisoner, obtained the black armor, and became invincible in the end of the world...