The film stars Dushyanth Jayaprakash, Gabriella Charlton,Radha Ravi, Charan Raj in the lead roles alongside an ensemble cast consisting of Shankarnag Vijayan, Haripriya Isai, Maheshwari Chanakyan, Jeeva Ravi, Arjunna Keerthivasan, Hyde Karty, Priyadharsan, Dumkan Maari and others in supporting roles.

On 22 March 2019, coinciding with the World Water Day, actor Karthi released the poster and producer G. N. Anbu Chezhiyan revealed the title of the film Varunan, along with the tag #SaveWater.

[2] The film is written, directed and co-produced by Jaayavelmurugun under his Vaan Productions banner along with Karthick Sreedaran's Yakkai Films banner[3] starring Dushyanth Jayaprakash in the lead role, who was last seen in Nirangal Moondru (2024)[4] with Gabriella Charlton as the female lead[5] alongside Radha Ravi, Charan Raj in important roles and an ensemble cast consisting of Shankarnag Vijayan, Haripriya Isai,[6] Maheshwari Chanakyan, Jeeva Ravi, Arjunna Keerthivasan, Hyde Karty, Priyadharsan, Dumkan Maari and others in supporting roles.

[7] The trailer released on 22 February 2025 with the voice-over given by Sathyaraj as the God of Water mentioning its importance.

[1] The technical team consists of S Srirama Santhosh as the cinematographer, U Muthayan as the editor, Bobo Shashi as the music composer, Dinesh Subbarayan as the stunt choreographer, and Paddhu as the art director.