The success of a film with such a delicate premise hinges entirely on its performances, and Green Chair succeeds on this front:

Critics acknowledged its flaws, particularly some of the acting from Shim Ji-ho, but praised its unusual, quirky wit and "sweet sexiness". The review aggregator site IMDb gives it a user rating of 6.6/10, reflecting this balanced but generally favorable opinion.

As the story progresses, the couple moves from their isolated world back into society. They face intense pressure from tabloid journalists

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While the young Seo-hyun is relentless in his devotion, Mun-hee struggles with guilt and doubt, fearing their age difference and social status make a long-term future impossible.

Green Chair centers on Mun-hee (played by Seo Jung), an attractive, 32-year-old divorced woman, and Hyun (played by Shim Ji-ho), a 19-year-old high school student. The film begins not with the inception of their affair, but with its legal aftermath. Mun-hee has just completed a short prison sentence and community service for statutory rape—a conviction driven by a conservative legal system rather than a complaint from Hyun, who is deeply in love with her.

The narrative centers on (played by Shim Ji-ho), a 32-year-old divorced woman who begins a passionate affair with Seo-hyun (played by Suh Jung), a 19-year-old high school student. The film begins with Mun-hee being released from prison after serving time for "statutory rape"—a sentence she received because Seo-hyun was technically a minor when their physical relationship started.