• Producer : Mani Ratnam , Karan Johar , Hiroo Yash Johar
• Director : Shaad Ali Sehgal
• Story : Mani Ratnam
• Writer : Mani Ratnam
• Screenwriter- screenplay : Mani Ratnam
• Dialog Writer : Gulzar
• Cinematography- Camera Man : Gulzar
• Composer : A. R. Rahman
• Lyricist : Gulzar
• Actor : Aditya Roy Kapoor

• Actress : Shraddha Kapoor

Aditya "Adi" Gunjal (Aditya Roy Kapur) comes to Mumbai to work for a gaming company owned by his boss (Prahlad Kakkar), aspiring to make it big in the United States as a video game developer. At Mumbai railway station, he spots a girl (Shraddha Kapoor) on the adjacent platform trying to jump in front of an approaching train. A horrified Adi gives her a shout. The girl then disappears. Adi moves into Gopi Srivastava's house (Naseeruddin Shah), his elder brother's senior, a strict, retired High Court judge living with his wife Charu (Leela Samson). Charu is a renowned Hindustani classical singer who suffers from stage two Alzheimer's disease. On his first day at work, Adi is encouraged by his friend Bantee to pitch the idea of his game "Mumbai 2.0" to his boss. Adi impresses his boss and gets a deadline of five months to prepare a prototype for Los Angeles for a competition. Later, while at his friend Jenny's wedding, Adi spots the girl from the station. The girl introduces herself as Tara. Adi learns that Tara is planning to pursue architectural studies in Paris, and he says that he dreams of becoming a big shot like Mark Zuckerberg. Adi and Tara strike a chord over their mutual presumptions on the dysfunctionality of the institution of marriage. Tara also reveals that her antic at the railway station was a ploy to get rid of her ex-boyfriend, who desired to marry her. Subsequently, they hang out, exploring the city. The next day, Adi pursues Tara to Ahmedabad on her work trip. Tara takes Adi to Sabarmati Ashram, which she used to visit with her father as a kid. She discloses that her decision never to marry was incited by her parent's broken marriage. Adi and Tara decide to live with each other before they go their separate ways for their respective careers. The two approach Gopi and Charu with their wish. Gopi initially strongly disagrees with their desire but then decides to give in when Tara impresses Charu with her classical singing ability. Adi's family plans to give Adi a surprise visit, and his sister-in-law finds out that he is living with Tara, which his brother would adamantly be opposed to. She asks Tara to ponder their future when Tara, at some point, would have to pick between her love and her career. Tara and Adi continue living happily, getting a thrill out of their endearing mutual camaraderie and growing affinity and attachment. Tara's admission to the institute in Paris gets approved. Tara informs Gopi of this and confides in him that it might now be hard for her to leave Adi and go so far away. The next day, Tara goes to Jaipur for a work trip, and Adi starts to miss her profoundly. Adi gets summoned to Kanpur by Tara's affluent mother, who wishes to know her daughter's intentions. As a result, Tara finds Adi missing when she returns from Jaipur and searches for him miserably, realizing that living without him would make her sad. Tara and Adi begin to understand the importance of each other's presence in their life, especially after seeing the love and patience Gopi has for his ailing wife. One day, she goes missing as she bewilderingly forgets the way to her own house and is found by Tara and Adi sitting on a temple platform in heavy rain. Tara's mother visits Adi's family to discuss marriage, infuriating Tara. Later in the day, Adi's game, "Mumbai 2.0," gets selected for the competition in Los Angeles, meaning that he has to leave for the United States soon. He confides in Jenny that it'd be hard for him to go to Tara. Tara, too, seems visibly vexed. The next day, Adi and Tara make a pact to enjoy themselves to the fullest for the next ten days, after which they will eventually go their separate ways. One day, Charu goes missing again. While looking for her, they start bickering about their relationship. However, after finding Charu and bringing her home back to her husband, Adi finally proposes marriage to Tara before leaving for their respective destinations. They get married in Gopi's house among close friends and family. Post marriage, both continue to accomplish their dreams, one in Paris and the other in Los Angeles, keeping in touch and waiting for the day to be together again. { An end credits roll plays the rest of their story in animation, with them finally living together one day and starting a family. }

• Track 1 : OK Jaanu ( ओके जानू )
• Track 2 : The Humma Song ( द हम्मा सॉन्ग )
• Track 3 : Enna Sona ( एना सोना )
• Track 4 : Jee Lein ( जी लेइन )
• Track 5 : Kaara Fankaara ( कारा फंकरा )
• Track 6 : Saajan Aayo Re ( साजन आयो रे )
• Track 7 : Maula Wa Sallim ( मौला वा सल्लि )
• Track 8 : Sunn Bhavara ( सुन भवरा )