Climax of this movie is inspired by the German movie 'Secret in their Eyes'.
This is Sukumar's first production.
Music composer Devi sri prasad and Cinematographer Rathnavelu did not take any remuneration for the movies as they were best friends of producer Sukumar.
'Kumari 21 F' is the official remake of the Telugu movie of the same title which was released in 2015 and was directed by Palnati Surya Pratap.
The original 'Kumari 21 F' itself was loosely based on the French film, 'Lila Says'.