Six years after the Switzerland episode, Raj has moved to Mumbai and found a job with Microsoft as a game designer with his best friend Sachin Kashyap.

This vision is shattered when Radhika declares that she intends to sacrifice her career to marry Raj and join him in Australia.

Unable to express his commitment phobia, Raj, along with Sachin, boards his flight to Sydney on the morning of his wedding.

Radhika learns this while waiting for Raj at the registrar's office dressed as a bride and is left heartbroken in the rain.

He meets Gayatri Divecha, a feisty and an independent woman who studies at a business school during the day, works in a supermarket and moonlights as a taxi-driver at night.

Her husband Joginder "Jogi" Singh Ahluwalia recognizes Raj from the Switzerland episode and knocks him out.

Firm in his decision not to leave without being forgiven, he befriends Jogi's friend Karan Bahl, who is set to be married.

At Karan's sangeet ceremony, Raj apologizes to Mahi and convinces her that Jogi is her true love, while also reconciling with the Pasrichas in the process.

However, before Raj goes home, she arrives and tells him that she realized that the root of her frustration was bottled-up hate against him that she no longer bears.

In April 2007, several sources indicated that director Siddharth Anand had cast Ranbir Kapoor as the lead for his next film.

However, he dismissed the rumors and called it "mere speculation" and "absolutely untrue,"[2] Anand later confirmed that Kapoor was indeed starring in his film.

[3] Anand was in talks with Preity Zinta, Bipasha Basu and Deepika Padukone for the female leads, but specified that "it wouldn't be right to reveal their names until we they were signed on the dotted line.

[7] Padukone's portions were filmed in Sydney, while the song "Khuda Jaane" was shot at multiple locations in Italy, including Venice, Alberobello, Santa Cesarea Terme, Mattinata, Apulia, Naples, and Capri.

[8] Lamba's portions, inspired by Aditya Chopra's Dilwale Dulhania Le Jayenge, were filmed in similar locations in Amritsar and Switzerland.

According to the Indian trade website Box Office India, with around 1,600,000 units sold, this film's soundtrack album was the year's sixth highest-selling, with the songs "Khuda Jaane" and "Bachna Ae Haseeno" being popular among the masses.