This movie impresses with the structural empathy that is built throughout the story. The Parks are not villains since they do not know anything about life beyond their walls due to their overwhelming wealth. The Kims are not villains either, but only people who learn to adapt to their circumstances.
The genius of the production design lies in its use of the vertical plane as a metaphor for class struggle:
Upper Mansion: Overfilled with light and representing blissful ignorance.
Semi-basement: Damp and suffocating and representing systemic injustice.
With its perfect pacing, great cinematography and numerous metaphors, the movie accomplishes the most amazing cinematic feat: it keeps you riveted in your chair while reflecting on modern capitalism.