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Bharath Srinivasan as Babu Kalyanam Ilavarasu as Kumar's Father Kalairani as Kumar's Mother Ramji as Bhaskar Delhi Kumar as Judge Siddharth as Munna Vivek as Mangalam Manikandan as Kumar Manobala as Ajay Janaki Sabesh as Munna's mother Hariharan as Himself K. G. Ranjith as Himself as a Music Award Show Host Genelia D'Souza as Harini Sathyan Sivakumar as Deepu S. Thaman as Krishna Nakul as Juju Senthil as Anna Veriyan S. P. Balasubramaniam as Himself as a Music Award Show Host Vijay Yesudas as Himself as a Music Award Show Host

Sabu Cyril Art Direction Annupamaa Playback Singer Kabilan Lyricist K. V. Anand Additional Director of Photography Tippu Playback Singer Karthik Playback Singer Vasundhara Das Playback Singer Sadhana Sargam Playback Singer Shankar Director, Screenplay, Story Vaali Lyricist A.R. Rahman Original Music Composer Lucky Ali Playback Singer Chithra Iyer Playback Singer S.P.B. Charan Playback Singer Pa. Vijay Lyricist Sunitha Sarathy Playback Singer Chinmayi Sripaada Playback Singer Sujatha Rangarajan Writer, Dialogue