A doctor, Dr. Mina Nariman, has raised the abandoned Jonathan/John since birth and she has planted a device in their brain to allocate the day equally.

The girlfriend is seen as a betrayal and causes Jonathan to become jealous and angry, ultimately telling Elena never to come back.

Jonathan reaches out to Elena to attempt to amend his relationship with John, which he values dearly.

Jonathan wants to make amends with his other half but John descends into depression and anger, eventually repeatedly attempts to commit suicide.

Abruptly, Dr. Nariman tells Jonathan that he is getting weaker while John, driven by his intense emotions and his fight with depression, is becoming stronger.

The movie ends without clarifying for the viewer whether Dr. Nariman had Jonathan "removed" or was telling the truth about the shortening shifts.

In August 2016, it was announced Ansel Elgort had been cast in the film, with Bill Oliver directing from a screenplay he wrote, alongside Gregory Davis and Peter Nickowitz.

[7][8] Shortly afterwards, Well Go USA acquired U.S. distribution rights to the film, and set it for a November 16, 2018, release.

[12] Variety film critic, Dennis Harvey, is not sure what genre to place this offbeat dual personality film, but he states: "'Jonathan' is an intelligent absorbing tale that provides an impressive showcase for 'Baby Driver' star Ansel Elgort".