Actor Vivek Oberoi says he is naturally more attracted to parts that have grey shades and darker sides.

Speaking about his upcoming Ram Gopal Varma's gangster thriller "Rai" the 39-year-old actor "I have been unfair to the fans of 'Saathiya' who wanted to see me do more love stories but I kind of enjoy playing grey characters more," the 39-year-old actor said.

Vivek, who started his movie career with Varma's "Company" in 2002, said "Rai" is not an ordinary gangster.

"It is a journey of a man who started out as small clerk and a regular job going guy from there to become the don of Bengaluru, it is an exciting biopic about a guy who is actually alive."

Calling the experience thrilling, the actor said, "To study a man like that and his mannerism of what happened in his life, it is extremely exciting and it's more than a gangster film."

Vivek will next be seen in adult comedy "Great Grand Masti".