f(x)'s Krystal unexpectedly shed tears before getting onto the ice for her beautiful performance. The August 21st broadcast of SBS's 'Kim Yuna's Kiss & Cry' will air the behind-the-scenes story between the the pairing of f(x)'s Krystal and Lee Dong Hoon. The energetic and unstoppable couple performed their winning Carmen performance for two days at 'Kim Yuna's Ice Show - All That Skate Summer 2011' on August 14th and 15th. It has just been revealed that the practice for the ice show was not easy due to Lee Dong Hoon's injury. Krystal even cried due to the nervousness she felt before getting on the ice to perform her routine. Even while having her own dance to perform, Kim Yuna displayed her worries for Krystal and did her best to comfort her before the performance. Be sure to check out the special episode of 'Kiss & Cry' on Sunday at 6:40PM KST. Source: Newsen via Nate