Critics kept asking director bong joon ho about the house and he couldn't help but reveal the truth.

This is ha joon lee as a production designer.

He's the mastermind behind the iconic homes and settings in the film parasite.

Production designer.

Production design is more than interior design.

It's telling a visual story so well and so believably that no one even notices that it's been done at all.

When it came to the park house.

The individual floors were shot on separate sets but later combined through computer graphics to create what looks like one perfect home.

In total, there were four different sets for the park home and one big water tank to make up the kims lower class neighborhood.

An important key in shooting a flood.

See Ha Joon oversaw more than just structural design.

He and his team also spent months picking out highly specific props.

For example, this simple trash can from the parks home costs $2500.

There's no formula for true set design.

But ha joon and the rest of the team of parasite must have done something right.

Parasite made history for being the first non english film to win an Oscar for best picture.

Ha joon was even nominated for best production design.