Ever wondered in your mind what's the one thing in common between f(x)'s Sulli, Lee Hyori, KARA's Seungyeon and SNSD's Tiffany? On the May 16th episode of Inkigayo, 2PM's Wooyoung posed the above question to his fellow MCs, Taecyeon and Sulli to which the latter replied, "Let me see, is it because of my prettiness?" Taecyeon got it right by saying, "What they have in common is their lovely eye smiles," before Sulli showed off her best representative smile by request. If you have to choose from them 4 though, who do you think has the prettiest smile?