Jo In Sung explained why he doesn't want to go on 'Running Man'!

In a recent interview, Jo In Sung said, "I don't appear on variety shows often compared to other actors. I sometimes go when Cha Tae Hyun�hyung invites me."

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The interviewer jokingly asked, "You went on 'Infinity Challenge' and '1 Night 2 Days'. Does that mean you're only determined to go on the best shows?" Jo In Sung responded, "I just went because they contacted me. As for 'Running Man', I think it'll be too much running. Also, you need to have some intensity on variety shows but I'm so close with Lee Kwang Soo. If viewers see how I really treat Kwang Soo, they'll be in for a surprise."