Oldboy (2013) Ending Explained

Oscar Flicker Profile Image
By Oscar Flicker
June 06, 2025

tl;dr:
The ending of Oldboy (2003) is a devastating culmination of revenge, incest, and psychological torment. After being imprisoned for 15 years without explanation, Oh Dae-su discovers his captor, Lee Woo-jin, orchestrated his suffering as payback for Dae-su accidentally witnessing Woo-jin's incestuous relationship with his sister as a teenager. The sister later committed suicide, and Woo-jin spent years plotting his revenge. The film ends with Dae-su learning he unknowingly slept with his own daughter, Mi-do, under Woo-jin's manipulation. To spare her the truth, Dae-su cuts out his tongue and begs Woo-jin's hypnotist to erase his memory. The final scene ambiguously suggests Dae-su may have retained his memories, smiling while embracing Mi-do in the snow.

Detailed Explanation of the Ending

The climax of Oldboy hinges on the revelation that Oh Dae-su's torment was meticulously engineered by Lee Woo-jin as retribution for Dae-su's careless gossip about Woo-jin's incestuous relationship with his sister. Woo-jin's sister killed herself due to the shame, and Woo-jin vowed to make Dae-su suffer similarly. After Dae-su escapes imprisonment, Woo-jin manipulates him into falling in love with Mi-do, a woman Dae-su later discovers is his long-lost daughter. This twist is the crux of Woo-jin's revenge: forcing Dae-su to live with the same taboo horror that destroyed Woo-jin's life.

The film's final act is a masterclass in psychological horror. Dae-su, upon learning the truth, begs Woo-jin to keep it from Mi-do, showcasing his self-sacrificial love. In a grotesque act of penance, Dae-su cuts out his own tongue to prevent himself from ever revealing the truth. He then seeks out the hypnotist who aided Woo-jin's scheme, pleading for his memories to be erased so he can live in ignorant bliss with Mi-do. The hypnotist agrees, but the final shot - Dae-su smiling in the snow while embracing Mi-do-leaves it ambiguous whether the hypnosis worked or if he's condemned to remember everything.

Unresolved Questions & Possible Answers

  1. Did the hypnosis actually work?
    • Yes: Dae-su's smile suggests he's blissfully unaware, living a "happy" lie.
    • No: His grin could be a manic acceptance of his cursed reality, a common theme in Park Chan-wook's films.
  2. Why did Woo-jin kill himself?
    • His revenge was complete; he no longer had a purpose.
    • He couldn't live with his own guilt after perpetuating the cycle of abuse.
  3. What happens to Mi-do?
    • She never learns the truth and lives happily with Dae-su.
    • She eventually discovers the truth, leading to another tragedy.

Themes & Symbolism

Oldboy explores cyclical revenge, fate, and the impossibility of escaping one's past. Woo-jin's revenge mirrors Dae-su's original sin-both are punished for spreading secrets that destroyed lives. The tongue-cutting symbolizes Dae-su's forced silence, a contrast to his earlier gossip. The hypnotist represents the illusion of escape, questioning whether ignorance is truly bliss. The snow in the final scene symbolizes purity, ironically juxtaposed with the corruption of Dae-su and Mi-do's relationship.

Personal Opinion

Oldboy's ending is one of the most brutal and unforgettable in cinema. Park Chan-wook doesn't offer catharsis-only devastation. The ambiguity of the final shot is genius, forcing viewers to grapple with whether Dae-su's smile is genuine or a mask of madness. While the incest twist is shocking, it serves the story's themes rather than feeling exploitative. The film's unflinching brutality and emotional weight make it a masterpiece, though not for the faint of heart. It's a grim reminder that revenge consumes everyone it touches, leaving no winners.

Final Thought: Oldboy isn't just about vengeance; it's about the inescapability of guilt and the lies we tell ourselves to survive. The ending ensures the horror lingers long after the credits roll.