The teaser for "Ek Deewane Ki Deewaniyat," starring Harshvardhan Rane and Sonam Bajwa, has generated significant buzz, promising audiences an emotional rollercoaster ride. The film, directed by Milap Zaveri, is now slated to release on October 21, 2025, coinciding with Diwali. The teaser was released on August 22, 2025.

The film is described as a "musical, obsessive romantic drama". The movie explores intense emotions such as love, obsession, and heartbreak. Harshvardhan Rane's character is set to showcase madness and passion. The film's tagline, "Iss Diwali, Diye hi nahi, Dil bhi jalenge. Mohabbat se takraayegi Nafrat, aag lagaayegi deewanon ki Deewaniyat!" translates to "This Diwali, not just lamps, but hearts will burn. Love will clash with hate, and madness will set everything ablaze!".

"Ek Deewane Ki Deewaniyat" marks the first on-screen collaboration between Harshvardhan Rane and Sonam Bajwa. Harshvardhan Rane is known for his intense roles in movies such as "Sanam Teri Kasam" and "Haseen Dillruba". Sonam Bajwa has demonstrated her versatility in films like "Punjab 1984" and "Ardab Mutiyaran". She is also set to appear in "Baaghi 4," releasing on September 5, 2025.

The film is written by Mushtaq Shiekh and co-written by Milap Zaveri. It is produced by Anshul Garg under his banner Desi Music Factory and co-produced by Raghav Sharma. This film marks Anshul Garg's debut as a feature film producer.

Initially titled "Deewaniyat," the film's name was changed to "Ek Deewane Ki Deewaniyat" to better reflect its emotionally intense narrative. The film was previously scheduled for release on October 2, 2025. The release date was shifted to October 21, 2025, to coincide with Diwali. "Ek Deewane Ki Deewaniyat" will face a box office clash with Ayushmann Khurrana's "Thama," also releasing during Diwali.

Milap Zaveri, known for directing action films like "Marjaavaan" and the "Satyameva Jayate" series, described "Ek Deewane Ki Deewaniyat" as a passionate love story. He also expressed excitement about Harshvardhan and Sonam's on-screen chemistry. Harshvardhan Rane has also expressed his gratitude for the audience's love for "Sanam Teri Kasam" and his excitement for the new role.

The music for "Ek Deewane Ki Deewaniyat" is composed by several artists, including Kunal Verma, Kaushik-Guddu, Rajat Nagpal, and Ankur R. Pathak. The lyrics are written by Kunal Verma, Asim Raza, Rana Sotal, and Sameer Anjaan, among others. The film features a lineup of singers, including Sonu Nigam, Shreya Ghoshal, Arijit Singh, and Jubin Nautiyal.