For his role in Sethu, Vikram used to tan under the sun to get the right look for the lunatic character. Surya followed in his footsteps for his role in Nanda. Now, his younger brother Karthi is acting in Paruthiveeran. For this film, Karthi is also doing the sun-tan act under instruction from the director Amir. Talking of these guys, their father, veteran actor Sivakumar said that in all his years in the film industry, he has never done such rigorous preparation for a role. He felt very proud of his sons. We are proud too, guys, keep up the good work.