Street Vendor on Loan

There are hidden taboos in the late night in Suzhou University Town. Street stalls after midnight are places where the living trade with the dead. I have made an iron rule that visitors can only buy one portion of food, and they will have to pay for the second portion with their lives. The dead female student said that I made an exception and killed her last night. I was suddenly frightened until another vendor with the same appearance as me appeared at the alley. Maybe the real stall owner has died long ago, and I, who is alive now, am the fake substitute. So who is the human and who is the ghost? The loser will disappear completely.