One of the reasons that TV is such a compelling medium is because it allows characters to really grow and develop over the course of many hours, whereas movies limit how much the audience learns and can watch a character evolve.
Parasite should capitalize on the serial style to really let fans get to know his characters.
The Park and Kim families are both filled with very interesting characters, so Parasite should start with them (or new characters) and build from there.
Parasite as a TV series could be even more compelling if it’s builds the characters first, and then focus on the storylines for the season.