It is also, as The Stubler pointed out, the location of a small, but interesting, outdoor "museum" or display relating to the production of yeontan, 연탄, which are the "Korean Kingsford", charcoal briquets, commonly found in Korean barbeque restaurants (the computer has tried to correct my spelling of both briquet and barbeque, but frankly I don't believe it).
Tucked away in a little corner of the D-cube City side's park, it actually has good English-language signage (above) explaining that the briquets, or 연탄, were first manufactured by Daesung Corporation as a result of the government's desire to slow the decimation of the country's forests for firewood in the middle of the twentieth century. Nowadays most home heating is done by gas. Daesung had a manufacturing plant in Sindorim--the "rim" part means "forest", but I don't know what the Sindo means.
First, coal is brought in and pulverized in the hammer mill:
Then it's sorted:
And then formed by pressing:
Here's the final product.
Interesting ten minutes.
Interesting Seoul Patch fact: The Sindorim Technomart post linked to at top is the seventh most visited page on this blog.