It’s also a lot of fun. Scripters Yoon Seung-min, Yoo-kang Seo-ae and Jo Sung-hee “borrow” from a variety of predecessors — “Silent Running,” “Blade Runner” and “Elysium” immediately come to mind — and overlay those familiar elements with a cheeky original premise. Director Sung-hee Jo’s handling is somewhat chaotic, which befits the rather “messy” future inhabited by a quartet of misfit heroes. The year is 2092. Earth has become an environmental nightmare, with fading sunlight and increasingly acidic soil contributing to the spread of deserts and the destruction of forests. Thanks to a technological “miracle” orchestrated by the UTS Corp., the wealthy and “connected” enjoy luxurious living in a massive, verdant and enclosed habitat orbiting Earth, reachable via a geosynchronous “space elevator” (long one of my favorite sci-fi concepts, and one that actually might be practical on lower-gravity worlds such as Mars and our moon).