I Still Believe will be produced by Jon and Andrew Erwin, who will also direct from a script by Jon Erwin and Jon Gunn.
According to The Hollywood Reporter, KJ App and Gary Sinise have agreed to join the cast of I Still Believe, the sequel to the 2018 indie hit I Can Only Imagine, which grossed over $80 million at the worldwide box office.
Apa and Sinise will play true-life father and son Jeremy and Tom Camp.
Apa is mostly known for his work as Archie Andrews on the hit TV series Riverdale.