Ranbir Kapoor and Deepika Padukone in Yeh Jawani Hai Deewani : Ayan Mukherjee

Sep 23. You wonder whether to bring an old flame, Ranbir Kapoor and Deepika Padukone back to the Karan Johar called Yeh Jawani Hai Deewani "was a tough nut to crack! Ayan Mukherjee But the director says it was a smooth process, because the two actors share a friendly equation.

"In fact, it was very easy. I know that the media had written much of its break-up, but really they are very friendly equation, and it was very slippery to put them together," said the two actors Mukherjee.The dated each other for over a year, and split 2009. So far they have done a movie together - Bachna Ae Haseeno "2008 This is the first film after the dramatic collapse of the 2009TH.

Mukherjee, however, of "Wake Up Sid" fame, is expecting a sizzling chemistry on the celluloid love story. "This is a love story, and I'm very excited about my cast. I hope to start around mid-January, and hopefully the movie is finished sometime in the middle of next year (2012)," he added.

The name of the movie is inspired by the famous RD Burman song 1970 hit "Jawani Deewani" and the title is apt and the director feels youthful. "The title comes from an old song, but it is also a youthful title. I think it means that the romance is young, and this is what it (the movie) is about," he said.