MUMBAI: Superstar Shah Rukh Khan, who is currently busy with his upcoming film Zero, says working has become "second nature" to him.

Shah Rukh on Tuesday treated his fans to a question and answer session, where a user asked him about his motivation to work hard.

"Don't know about motivation. But working has become second nature to me," Shah Rukh replied.

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A Russian fan asked if Zero will release in their country, the 52-year-old star said, "Yes, I hope it releases there soon."

Talking about how Zero is shaping up, the Dilwale actor tweeted, "Audience has to be happy not me. I just do my best and leave the rest."

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Directed by Anand L. Rai, Zero features SRK as a vertically challenged man. The film also stars Anushka Sharma and Katrina Kaif.