Zombie: I Carried an Old Man on My Back and Turned Out to Be a Ghost

In the middle of the night, I was delivering a message for Uncle Jiu. In the wilderness, I met an old man who had fallen and asked for help. The further I walked, the heavier I got and my neck tightened, only to realize that there was no human being on my back at all - I couldn't throw it away now, and I couldn't run away, because there was a mass grave ahead of me.