Watch the movie from start to finish and pay attention to the world building. It’s masterful.
Then pay attention to how the world is unveiled throughout the film. It’s not all at once but but by bit, from the bottom up. This style uses the concept of “the half known world” to add suspense—I’d posit not only for the viewer but the writers while drafting the story.
Suspense isn’t just in what happens. Suspense is in what’s not said, the world within which the film takes place. The unknown makes the movie more exciting, enthralling, and inevitably more enjoyable.
Maybe the same is true for our half-known lives, too.