The film is based on Luke Davies' novel, and Luke Davies has a long history of drug abuse. He publicly hopes that there is some emotional authenticity in this fact-based film, and admits that he has been in "that world" for several years. What the film director Neil Armfield wants to express is about people's desire to pursue happiness in any form, even at the expense of self-destruction. Heroin is just a metaphor adopted by the film. The characters in the film try to live in the ultimate happiness, and they try to make love eternal. Human beings always want to keep the good things, remove the bad things, and stay in the happy moment forever. This is very human and also tragic.
In order to play this role well, starring Heathy, he deliberately learned from a man with a history of drug abuse for 25 years. Heathy sat and chatted with the man for an afternoon, and learned the injection technique on the arm model from the man
.
