Last week, SNSD's Jessica made a surprise visit to the practice set of SBS's 'Kiss & Cry' to lend her support to younger sister f(x)'s Krystal. Krystal emphasized expression in her performance and showed off her high level of skill by incorporating lifts. Krystal had always been known for utilizing her long limbs to bring beauty into her performances, but this time around, she went for a stronger style that required more skills. Jessica said, "This is my first time seeing Krystal skate in person. She's so good and did so well in expressing everything. I could feel that she was at ease with it. When I saw her before the match, she said that she was even more nervous because I was here to watch. She truly did well, though." Check out the full performance on July 3rd! [gallery columns=4] Source + Photos: Newsen via Nate