"Oasis" is the story of the relationship of a man imprisoned by his mind with a woman imprisoned by her body. That they establish a relationship comes as much because of their handicaps as in spite of them.
I knew before seeing the film that Moon So-ri was an able-bodied actress. As a result, at first I wasn't convinced she was playing someone with cerebral palsy. But Lee Chang-dong does a brilliant thing. He films several scenes that become the imaginings and fantasies of Gong-ju, Moon's character, as an able-bodied woman. This had the effect on me of seeing Gong-ju as disabled. And it spells out clearly that cerebral palsy is a physical condition not a mental one.
Sol Kyung-gu as Jong-du is perfect. I've been describing Jong-du as "simple-minded" to others but that doesn't pinpoint his mental condition. I might say he is carefree but it's not just an attitude; he is carefree to the point of mental illness. His condition makes him act both bad (he's been in prison three times) and good (he absolutely sees right through Gong-ju's handicap and truly comes to care for her). While Gong-ju is frustrated over her condition and how others use her it, Jong-du appears so utterly accepting of his fate that he doesn't even defend himself. I can't stop thinking about how Mr. Sol has played this interesting character.
Both Gong-ju's and Jong-du's families scorn and pity their conditions. But watch how they also come to exploit them as well.
I highly recommend this film.