Iruttu (transl. Dark) is a 2019 Indian supernatural horror thriller film written and directed by V. Z. Durai. It stars Sundar C., Sakshi Choudhary and VTV Ganesh in the lead roles. While Vimala Raman, Dhanshika, Yogi Babu, and Manasvi Kottachi play supporting roles. The music for the film was composed by Girishh G. while cinematography was handled by E. Krishnasamy. The film had its theatrical release on 6 December 2019 and opened to generally mixed to positive reviews. It was later dubbed in Hindi and released under the title Qatil Saya.. The film is a remake of the Korean film The Wailing.