Filmmakers have various ways of envisioning their piece before shooting takes place. One of the most traditional is via hand-drawn storyboards.
This is the favoured method of Parasite creator – and multi-Oscar nabber – Bong Joon-ho, and the video below features a split screen with original storyboards at the top and the final filmed product underneath.
The difference in how he works compared to many directors is that he apparently sticks to his storyboards, without shooting “coverage” – different angles and takes. Hey, it worked for Alfred Hitchcock!