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OK Jaanu is a 2017 Indian Hindi-language romantic drama film directed by Shaad Ali, with screenplay and story based on Mani Ratnam's Tamil film O Kadhal Kanmani, and produced by Ratnam and Karan Johar under their banners Madras Talkies and Dharma Productions respectively. It is a remake of Ratnam's Tamil film O Kadhal Kanmani. The film stars Aditya Roy Kapur and Shraddha Kapoor with a supporting cast including Naseeruddin Shah and Leela Samson, the latter of whom appeared in the original as well marking her Hindi debut with this too- who essay the protagonists' landlords. A. R. Rahman composed the film's score and soundtrack. Gulzar has written the lyrics and the dialogues for the film.