Having made her first comeback on Music Bank yesterday, JJ continued her promotions with her second live performance on the March 20th episode of Music Core. With her new transformation and trendy new dance song titled More and More, JJ will be hoping to erase her flop debut back in 2007. Did she do better in her second performance? Check it out for yourself. http://www.youtube.com/watch?v=BOoRsEIbKLQ