I'm writing this review purely because I feel its been given the same injustice that The Blue Hour has, and ironically enough, for the exact same plot twist.
Night was never real. He was a figment of Wine's imagination created for him to deal with not being loved the way he wanted to be. He created the perfect boyfriend in his mind and, huzzah, can also use him as an excuse to torture his ex-boyfriend and get P'Boy out of the picture.
Night only comes into existence the night that Wine is left alone in the abandoned building with the realization that Tee, the boy he was in love with, had tricked him and was probably off making fun of him with his mates.
When he slit his wrists to feed Night, and Night found him on the floor passed out, this was actually a suicide attempt.
The final scene is a perfect wrap up of the movie if you view Night as an imaginary character. It makes no sense for him to be real and to magically appear in a jail cell with him.
Most people assume that he's just imagining Night in the final scene, but that he's real in all the others. Which is fair; each to their own.
The movie. however, makes much more sense and is a better watch if you treat Night as a catalyst for symbolism and a reflection of Wine's emotional turmoil.