In Infernal Affairs, two men live secret lives—one is a cop working undercover in a dangerous gang, and the other is a gangster secretly working as a police officer. Both are trying to discover the other’s true identity, but the deeper they go, the more dangerous it gets for them.
A key moment happens when both men, realizing their secrets are unraveling, face each other in a tense showdown, but neither truly wins. It’s a heartbreaking moment because they’ve both lost their sense of who they are, caught in the middle of a web of lies.
Fan theories suggest that the film’s complex story shows how the lines between good and evil can blur, with both characters being victims of a system that pushes them into these dangerous roles. What if the two men had teamed up to expose the corruption they both fought against? Could they have stopped the cycle of betrayal?
The movie leaves some unanswered mysteries, like how the underworld influences the police force. An alternate ending could show the characters working together against the system, or a prequel exploring how the two men first got tangled in their roles, giving us a deeper look at their backgrounds.