 The choice of Siddharth was because of the sheer relevance to the character in real life . However , they finalized the choice of the actor only after the script was ready . The choice of Genelia was based on her natural vivacity in real life . This and her eyes , according to Bhaskar , made her an obvious choice for her character . More so , she liked the one line story that Raju told and also a few scenes that he narrated to her . She immediately liked the character and consented for the role . The fact that her co @-@ actor , Siddharth and she acted earlier together in Boys ( 2003 ) , made them more comfortable to work with . The camaraderie that the lead actors shared during the filming , added to their good performances . The choice of Prakash Raj was easy as he befitted the character he portrayed while , Jayasudha was persuaded to play the role of the lead actor 's mother . 
