So, who was our landlord anyways? Why did I say he was an unreliable narrator?

He's a lunatic who killed the real landlord, kept the body in the closet and proceeded to pretend to be the landlord's relative :)

In the epilogue, you find out he operated as the landlord for five years and is now in police custody as a suspect for several murders. His tale of events is actually a recount to the police of what happened, but the police note that his story is partially impossible, hence the unreliable narrator part. In fact, Bai Yi and Old Zhang were found murdered in two separate locations before the story that 'landlord' was telling them could have happened and the pharmaceutical person Qin didn't exist. The police officer we follow notes that 'landlord' has his fingerprints melted off/destroyed, but also that one tenant, the murderer Yang Rui, has no physical evidence of even existing. Landlord is suspected of making up Yang Rui and is later put in prison. At home, officer finds that landlord's confessional journal (that landlord insisted he read) was snuck home in in his brief case and he proceeds to read it several times that night, finding himself ruminating on it's contents and unable to sleep. Later on, officer cuts a deal with a drug lord and sells out several undercover cops in exchange for a huge chunk of money that he uses to buy and refurbish an apartment building. After installing several hidden cameras and microphones, he watches his tenants under the guise of upholding justice and social reform. Who is also a tenant of this officer's building? The elusive Ms. Yang Rui, who walks into the view of the cameras with a new murder victim :)

The serial murderer drugs her victim and does all sorts of things to his body. Things like drugging him constantly with sleeping pills and pumping water directly into his stomach, etc. This I can still accept because it is a work of fiction. I do not expect 100% accuracy.

But when it comes to injecting things into the blood stream, my mind just starts thinking about everything that is going wrong. Because I study about the human body, it is something I cannot help but be picky.

Like with an unhygienic needle, I started thinking about infection. Injecting milk and soy sauce into the blood, in my mind, I am thinking this man's cells are going to go crazy and he is going to die soon.