A fine mixture of science fiction, big brother, great actors and a tempting sound track.
The story itself was new to me in the genres and this alone makes a great plot (its not that easy to develop new stories after 100+ years of motion pictures).
Some hickkups might have been needed to correct tho. An aircraft flying in 5000 KM(!) height is more a case for NASA than for a Korean airline. A small tip to those creating stories: although its science fiction, the parts in the "here and now" should be at least a bit realistic. And this flight level is simply reserved fo satellites. (or simply: as realistic as a real world hospital movie in which the main actress would wear highheels during station duty...)