"There were a lot of workout sessions too because I had to gain weight first and then, as the shooting progressed, I had to lose weight.
"I had trained with rats and had them run over me. It was a lot of fun. I was enjoying each and everything," he said.
Suraj was just 16 when Lee signed him for the big screen adaptation of the bestselling novel. After three years, the film is complete and "being a part of the film has been a life-changing experience", he said.
"It has really changed me and how I perceive the entire world in many ways."