. Haunted by the ghost of Chan Wing-Yan, Lau’s desire to become a "good cop" transcends professional ambition and devolves into a full-scale identity crisis. Schizophrenic Dissociation:
If you found the timeline confusing or the ending ambiguous, this article will help you piece together the key themes, characters, and narrative structure of the finale. Infernal Affairs III
They were wrong. Or rather, they were looking for the wrong thing. They were wrong
Ming tracks down a retired police psychiatrist, Dr. Kwan, who treated Lau in secret. Dr. Kwan warns him: “You’re not investigating a case. You’re stepping into a hall of mirrors. Lau Kin-Ming suffered from a condition I call Infernal Recursion . He could no longer distinguish his own memories from the mole he was hunting. He began to become Chan Wing-Yan.” Kwan, who treated Lau in secret
Infernal Affairs III (無間道III：終極無間) (2003) Plot Analysis FAQ
The Psychological Labyrinth of Infernal Affairs III Infernal Affairs III: Ultimate Inferno