This behind-the-scenes short documents the creation of Reincarnation, a dystopian sci-fi film set in a future where a powerful corporation offers people the promise of a “new life” through a mysterious system known as The Door. The project explores the full AI filmmaking process, from concept and world building to shot generation, compositing, sound design, and final assembly. It highlights the creative challenges of maintaining visual consistency, emotional clarity, and narrative cohesion while working across multiple generative tools, and shows how human direction and restraint shaped the final cinematic experience.