Warning: The following synopsis contains major spoilers and graphic content.
The film follows Kim Soo-hyun (Lee Byung‑hun), a diligent and emotionally reserved secret agent for the National Intelligence Service (NIS) of South Korea. One night, while on a routine outing with his fiancée Jung‑hee (Kim Min‑hee), they are attacked by a serial killer known only as Jang Kyung‑chul (Choi Min‑sik). Jang brutally murders Jung‑hee and leaves Soo‑hyun devastated.
Driven by grief and an overwhelming desire for revenge, Soo‑hyun abandons his official duties and embarks on a personal vendetta. He tracks down Jang, only to discover that the killer is a charismatic, highly intelligent sociopath who revels in the act of killing. i saw the devil lk21 free extra quality
The narrative then evolves into a cat‑and‑mouse game where Soo‑hyun uses every resource at his disposal—legal authority, weapons, and personal connections—to inflict psychological torment on Jang. He repeatedly captures and releases Jang, each time subjecting him to increasingly brutal and grotesque punishments: forced drug injections, mutilations, and public humiliation.
However, Jang proves to be a master manipulator, turning each encounter into an opportunity to psychologically destabilize Soo‑hyun. He begins to infiltrate the agent’s life, targeting friends, colleagues, and even the broader police apparatus, forcing Soo‑hyun to confront the line between justice and vengeance. Warning: The following synopsis contains major spoilers and
As the cycles of violence intensify, the film asks: At what point does a hunter become the hunted? Both men spiral deeper into darkness, with the final act culminating in a bleak, ambiguous resolution where the boundaries between victim and perpetrator are irreversibly blurred.
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