In Parasite (2019), the decorative rock given to the Kim family by Min is described in the English subtitles as a "scholar's rock," and that it was said to "bring material wealth to families." Indeed, shortly after the Kim family got the rock, they got material wealth from their new jobs.
I don't quite understand the significance or symbolism of how it was used. After the flood, Ki-woo was hugging the rock and said that "it [the rock] keeps clinging to me." Ki-woo attempted to use it as a weapon to attack or kill Moon-gwang (former housekeeper) and Geun-se (Moon-gwang's husband), but this plan backfired.
Near the film's conclusion, Ki-woo placed the rock in a stream. This was after they've already lost their material wealth: their belongings (to the flood) and their jobs.
What is the rock's significance? What does it symbolize? Is there a Korean cultural significance to scholar's rocks that is being referenced in the film?