In the year 2125, a bizarre virus swept the world, plunging the world into chaos. In 2130, the virus mutated again, and many infected people gradually lost their minds and became living dead who only knew how to kill, known as "corpse slaves", and spread around the world. The ...... of the world There are less than a billion mouths left! In order to fend off this endless "corpse slave", the remaining humans have poured everything into building thirty-two megacities, each with sting-like steel walls to protect the last remaining humans. In 2155, the original 32 cities were reduced to 5! In 2199, humanity finally began to evolve itself under the pressure of the virus! With the continuous strengthening of physical fitness, people finally break through some kind of shackles and open the pineal gland in the brain, which makes the mental strength increase dramatically! In 2249, later known as the first year, mankind officially entered the era of cultivation from the age of science and technology. In the first year of 0020, mortal beings, who originally lived in 2125, woke up among the ruins with their best friend Fat Man......