The film starts off with the onstage robotic 'introduction' of Ved Vardhan Sahni (Ranbir Kapoor). The story then gets into a flashback mode wherein the audiences are introduced to the childhood of Ved, who gets mesmerized and enchanted by stories. The 'impact' of these stories told during his childhood is so huge that it starts hampering his 'corporate life'. The story then takes the viewers to Corsica, the place that he chooses to break free from his routine stereotyped life. It is here where he meets Tara Maheshwari (Deepika Padukone), an 'Asterix' crazy Indian who gets stranded in Corsica because of her lost baggage. When Ved and Tara meet, they get into an agreement that they will refrain from asking each other's personal details and that whatever they tell each other will be only lies, and lastly, 'what happens in Corsica, stays in Corisca'. That's why they decide to become 'Don' and 'Mona Darling' respectively. Thus continues their journey of break free and unknown identities. The duo enjoy each and every moment of their life to the fullest, till one day Tara gets her passport to go back to India. The two depart with the promise that they will never meet each other ever again. Life then becomes the routine for the two in India (although in different locations)… till one day they meet again. That's when they, not just reveal their real identities, but also grow extremely fond of each other. When the going is simply smooth and great, Ved proposes to Tara in front of his entire office by giving her a ring. However, contrary to everyone's expectations Tara drops a bombshell on Ved and his friends by not accepting the ring. This corporate show shatters Ved's life, so much so that he gets fired from his job. What is the reason that Tara to reject Ved's proposal despite being head over heels in love with him, does Ved ever get his job back, how do Ved's parents react to his job failure, do Ved and Tara ever come together is what forms the rest of the story.