Kumari 21F is a 2015 Indian Telugu-language drama film directed by Palnati Surya Pratap, and written and co-produced by Sukumar with Vijay Bandreddi and Thomas Reddy under their banners Sukumar Writings and P. A. Motion Pictures. Devi Sri Prasad composed the film’s music and R. Rathnavelu was its director of photography. Kumari 21F focuses on a romantic relationship between Siddhu, a chef and Kumari, a struggling model. Siddhu’s friends doubt Kumari’s character and she rejects his proposal, citing a lack of maturity. The film’s centrepiece revolves around Siddhu’s realisation and his attempts to unite with Kumari after an incident.
The film was produced on a budget of ₹60—150 million. Sukumar took inspiration from his college days in Razole where a young woman went to a picnic with some young men; a major undertaking for a woman at that time, which earned her the undeserved label of a “loose” character. Raj Tarun and Hebah Patel were signed to play the roles of Siddhu and Kumari. Neither Prasad nor Rathnavelu was charged remuneration for the film. Principal photography commenced in December 2014 and was finished in 70 working days; according to Rathnavelu, lighting played a key role during the filming process and digital low lighting photography techniques were used.