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