Ram Kapoor, Vivan Bhatena, Vipin Sharma and Shefali Shah play supporting roles in the film.

After being derided by his boss Mr Kamath yet again; Karthik figures his life can't get any worse and decides to commit suicide.

His chats take place every day at 5:00 a.m. and the caller provides advice on Karthik's problems, guiding him to become a successful man, win Shonali's heart, and bring color to his otherwise dreary life.

Karthik travels to an unknown place, takes shelter in a small hotel, and asks the receptionist to remove the telephone and room number plate.

Meanwhile, Shonali is contacted by Dr. Shweta Kapadia, who reveals the twist: Karthik actually suffers from schizophrenia, a mental disorder characterized by abnormal social behavior and failure to understand reality.

Karthik would wake up in the middle of the night, leave himself messages as his alter ego, and return to sleep, where he would awake once again at 5 AM to take his own calls.

In an effort to prepare for his role as the introvert loner Karthik, Farhan Akhtar isolated himself at home and turned off his phone.

[3] Nikhat Kazmi of Times of India rated the movie 3.5/5 stars, calling it "immensely watchable, purely for the class act by Farhan Akhtar in the title role" and recommending it to those who are in the mood for serious cinema.

[8] Sukanya Verma of Rediff.com gave the film a 2.5/5 rating, praising Farhan Akhtar for his versatility, while simultaneously criticizing Deepika Padukone for not being able to "hold a single scene on her own".

[15] Though the album did not get favorable critical reviews, the track "Uff Teri Adaa" created waves[16] and topped the charts numerous times in the following months.