Unexpectedly, f(x)’s Krystal had tears of nervousness for her beautiful performance of ‘Kiss and Cry.’ A broadcast of SBS’s ‘Kim Yuna’s Kiss & Cry‘ behind the scenes will be held on August 21st, which will be talking about the pairing of f(x)’s Krystal and Lee Dong Hoon.

On August 14th and 15th, the couple astonishing danced their Carmen performance for two days at ‘Kim Yuna’s Ice Show – All That Skate Summer 2011‘.

It was reveled that the practice of the couple was very hard due to Lee Dong Hoon’s injury. Because of that Krystal even cried tears of nervousness before their performance.

When Kim Yuna noticed Krystal’s nervousness she nicely went to confort her even when she had her own performance to think about.

Be sure to check out the special episode of ‘Kiss & Cry’ on Sunday at 6:40PM KST.