Ranjith Sankar is known as the man behind hit films like Passenger, Punyalan franchise, Pretham franchise, Njan Marykutty and Su Su Sudhi Vatmeekam. Most of his films had big stars as the protagonist. But for his upcoming mystery thriller Kamala, his choice for the protagonist was Aju Varghese. This has surprised everyone including the actor himself. Ranjith reveals that he zeroed in on Aju after playing all the big heroes in his mind for the character. It was finally that he fixed Aju. The reason he reveals for not casting big heroes is that it is a complicated character in a concept-oriented film and would have required a completely different treatment had big names been cast.