Walking Alone Indefinitely

[Doomsday + zombies + no heroine + worrying mental state + decisive killing] You are more than you, I am only me Bai Chen traveled through time! The apocalypse broke out on the first day of time travel! After the apocalypse broke out, Bai Chen's system disappeared as soon as it was bound. He could only rely on a knife given to him by the system to wander in the apocalypse. In the two years since the apocalypse broke out, he lost a lot and became mentally ill, thus embarking on an endless road of solitude! The introduction is too weak, let's move on to the main text!