Ji Chang Wook and YoonA's chemistry was incredibly great in the drama 'The K2' that it led to suspicions about their relationship. 

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In an interview with dongA on December 1, Ji Chang Wook shared thoughts about the speculations, and said, "The dating rumors involving YoonA are not true.

I just worked hard and, again, a lot of people came to misunderstand this time. So I thought, 'Again?' and just laughed. I've also talked to YoonA about these rumors and we just laughed it off.

"I always try to be very considerate of the actress. I think good acting results when working together in a comfortable environment. And that also helps to increase the viewers' focus but that tends to lead to misunderstandings. I think that's what happened again this time. There isn't anything special between YoonA and me. It'll be perfect to describe us as close oppa-dongsaeng."