- Miracle in Cell No. 7 is based on the 2013 South Korean film of the same name directed by Lee Hwan-kyung.
- The protagonists’ residence is situated somewhere along the Marikina River. Several other aspects of the film were changed from the source material including the names of the characters.
- The prison which served as the main setting of the Philippine adaptation was filmed in a sound stage in Cainta, Rizal.
- It is one of the eight official entries to the 2019 Metro Manila Film Festival.
- A teaser was released in November 2019 for Miracle in Cell No. 7 which had at least 7 million online views in 24 hours.
- The full trailer for the film was released in December 2019. Lead actor, Aga Muhlach also guested in Headstart to promote the film. Miracle in Cell No. 7 premiered in cinemas across the Philippines on December 25, 2019, as one of the official entries to the 2019 Metro Manila Film Festival. The film was distributed by Viva Films.