"Black Knight" is a Korean sci-fi TV series aimed at teenagers that falls short on multiple levels. Despite its potential, the show suffers from a low budget, poor world building, and a silly premise that is hard to take seriously.
The premise of the show centers around a world where oxygen has become a scarce resource, despite being the #1 most abundant element on the planet. The show attempts to create a dystopian future where oxygen is so precious that people are forced to risk their lives and kill each other over it.
Furthermore, the way in which the show handles oxygen is absurd. The characters wear filter-type masks that provide no oxygen, which seems like a glaring oversight. The delivery of oxygen by truck in tiny bottles is equally ridiculous, as that amount of oxygen wouldn't last a day. Surely, the creators could have come up with a more believable solution, such as piping in oxygen or building domes with oxygen generators.
The characters in "Black Knight" are cartoonish and one-dimensional, with no real depth or development. The action and fight scenes are similarly silly and unimpressive. All in all, "Black Knight" is a forgettable show that fails to deliver on its promise of an engaging sci-fi adventure.