Filmed in 11 days.
Aftermath is based on the directors' 2020 short film of the same title. Although all the actors from the short film returned for the full-length version, their characters are not identical to the 2020 version. The short film focused on the male protagonist, while in this case the female character is the protagonist of the film.
The film employs 28 actors, the most the directors have ever worked with.
In some scenes of the film, the filmmakers worked with real firefighters and paramedics. Two of them, László Pavelcze and Péter Klupács, saved many lives in the 2023 Turkey-Syria earthquake. As of 6 March 2023, more than 52000 deaths were confirmed.