The original screenplay was only 30 pages. The film was originally set only in the spa and within one day.
The film's idea came from when a friend of director Andrew Ahn told him a story about hot hookup with a guy in the steam room of a Korean spa.
Some of the research for the film involved online forums, and scouting spas. However, when trying to get permission to shoot the film at the spas, once the business owners knew of the content, the filmmakers were denied.
When director Andrew Ahn originally proposed the film on Kickstarter, he called it a "coming out" film. However, after the editing process, it eventually became a film about family.
The spa scenes were shot in one night due to budgetary restrictions.