In the final shot, Ming sits at his desk. He taps his cast in Morse code. The code spells out a message we heard earlier in the film: "I want to be a good man." He taps it endlessly, a prayer for a god who isn’t listening. Dr. Lee walks in, and for a second, we think he might confess. He doesn't. He smiles his charming, empty smile. The camera holds on his face. The film ends.
Andrew Lau’s direction and the film’s editing intentionally rework visual motifs from earlier films—mirrors, stairwells, and narrow corridors recur—creating an echo chamber effect. The pacing is measured; the film favors mood and psychological tension over kinetic spectacle. Cinematography and sound design underscore the claustrophobic moral landscape. Infernal Affairs III
Then, we see a flashback: Chan Wing-Yan, moments before his death in the first film, walking out of that same elevator. The two images overlap. Ming and Chan, trapped in the same tiny steel box, separated by time and death. In the final shot, Ming sits at his desk
The climax revolves around incriminating audio tapes. In his madness, Lau attempts to arrest Yeung by playing what he thinks is proof of Yeung’s guilt, only to accidentally play a recording of his own conversations with Hon Sam. 4. Watching Tips Must-See Pre-requisites: Critics strongly advise watching Infernal Affairs I He smiles his charming, empty smile