Before diving into the sequel, let's revisit the original film. "Constantine" was based on the DC Comics/Vertigo series "Hellblazer" created by Jamie Delano and Garth Ennis. The movie deviated from the comic book series but retained the core character and his struggles. Keanu Reeves brought John Constantine, a chain-smoking, hard-drinking, and foul-mouthed demon hunter, to life on the big screen. The film's success can be attributed to its dark humor, stylish visuals, and Reeves' performance.

Keanu Reeves sendiri secara terbuka membagikan kabar terbaru dalam wawancaranya. Setelah sebelumnya mengisyaratkan bahwa proyek ini sudah "siap untuk naskah" pada Februari 2025, Reeves memberikan kabar lebih menggembirakan pada Oktober 2025: naskah baru telah selesai dan siap diajukan ke studio.