[OSEN=Reporter Sun Mi-kyung] Actress and singer Uhm Jung-hwa has revealed her perfect six-pack. On the 16th, Uhm Jung-hwa posted a video and photos of herself working out on her social media. The video showed Uhm Jung-hwa concentrating on her workout at the gym. She was focused on abdominal exercises with precise form. Dressed in comfortable workout clothes, she was seen sweating while using equipment or exercising with just her body weight.