O Kadhal Kanmani, also known as OK Kanmani, is a 2015 Indian Tamil-language musical romantic drama film written, directed and produced by Mani Ratnam. The film stars Dulquer Salmaan and Nithya Menen, portraying a young couple in a live-in relationship in Mumbai. Prakash Raj and Leela Samson play supporting roles as an older couple in the film, portraying the younger couple's landlords. The film was said to be a "reflection of the modern mindset of urban India", dealing with issues such as marriage and traditional values. The film featured music composed by A. R. Rahman, cinematography by P. C. Sreeram and editing by Sreekar Prasad. The title of this film is borrowed from the song 'Pottu Vaitha Kaadhal Thittam' from Kamal Haasan's 1992 film Singaaravelan.