Karan, who is a known face on television with shows like "Qubool Hai" and "Dill Mill Gaye" in his kitty, was last seen in Bollywood film "Alone" alongside Bipasha Basu.
"I have always played the sweet, lovable good guy... This film had a negative role for me. This film gave me the opportunity to grow as an actor. It's a hit franchise, so it's a bonus to be a part of it," Karan told PTI.
"The first two films in the series ('Hate Story') were a revenge story from the perspective of a female. The third one is from the perspective of a male," he said.
"I did not it as a risk. I think as actors we must always try to do something new and different. For the ten years I have played the good guy. I am trying to offer variety to the audience as an actor. I am hopeful the effort would be acknowledged," he added.
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Produced by Bhushan Kumar, "Hate Story 3" also stars Sharman Joshi, Daisy Shah and Zarine Khan.
"He (Sharman) is a good actor... I think I got better because of him. Daisy and Zarine both have done a good job. I had a great time working with them," Karan said.