Zombies Are Coming, I Lie Down in the Sewer

I never thought that one day I would be unable to return home because of being chased by zombies, so I had to take my son and hide in the sewers. Due to the sudden outbreak of the zombie virus, unprepared people were easily torn apart by the zombie flow, and the social structure was also being reorganized. In this cruel and inhumane end of the world, I don't know if I can survive to the end with my son.