Miracle in Cell No. 7 was directed by Nuel Naval and written by Mel del Rosario under Viva Films. The film is an adaptation of the 2013 South Korean film of the same name. The original film was directed by Lee Hwan-kyung.
The film, being a Philippine adaptation of a South Korean film, is set in the Philippines. 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.
Aga Muhlach's character is the counterpart of Yong-gu of the original Korean film, while Bela Padilla's character was the counterpart of Yong-gu's daughter Ye-seung. Among the challenges posed by the adaptation process is how a faithful depiction of Philippine prisons would affect the film's plot. In the original South Korean film, the prisons were closed confinements with metal doors, while in the Philippines, prisons are less restrictive with metal railings instead, which would pose a problem in how the lead character's fellow inmates would hide his daughter from the jail wardens. The Philippine film also had less focus on the trial portion compared to its South Korean counterpart.
