Rust discovers a suspected murder weapon hidden in his home, which not only threatens his freedom, but also hints at the hidden betrayal and carefully planned frame-up.

The metaphors of the undiscovered murder weapon and water glass indicate that the framer is among those close to the protagonist, adding to the tension and unpredictability of the story.This reveals the fragility of trust and the potential dark side of close relationships.

The wife's confession is the shocking point of the plot. She walks out of the shadows and admits her crime, and then disappears into the darkness. This scene symbolizes the brief revelation and concealment of the truth, as well as the character's inner struggles and contradictions.

Rust faces an extreme conflict between law and personal emotions.Although he was legally found innocent, the truth revealed put him in a moral dilemma and he was unable to deal with the crimes within the family through legal means.

Through the subsequent dialogue between the couple and the protagonist's confession, the film completes the closed loop of the story.