f(x)'s Sulli proved her natural beauty with just one old photo. Well, she's proved her beauty many times before with many past photos, but here's another one to add to the list. The photo is a screenshot from the 2008 movie, "Fool/BA:BO", which starred Sulli as well as actress�Ha Ji Won. Sulli was actually playing the younger version of Ha Ji Won in the movie. The movie was made only three years ago, but Sulli looks exactly the same (albeit a little younger).�Fans wrote, "She didn't change at all", "Natural beauty", "So cute", "I need to see the movie again", and "Keep growing like this." Source: Medical Today via Nate