Directed by Shaad Ali Sahgal ; written -LRB- in Hindi , with English subtitles -RRB- by Jaideep Sahni , based on a story by Aditya Chopra ; director of photography , Abhik Mukhopadhyay ; edited by Ritesh Soni ; music by Shankar-Ehsaan-Loy , with lyrics by Gulzar ; choreography by Vaibhavi Merchant , Bosco-Caesar and Shiamak Davar ; production designer , Sharmishta Roy ; produced by Mr. Chopra ; released by Yash Raj Films .