Thankfully, f(x) was able to return asap after Amber, Krystal, and Sulli were diagnosed with swine flu, yesterday on KBS Music Bank. And today, they performed Chu~? on the beautiful island of Jeju. Their performance was lovely and of course, cute! It's great to see them back, looking healthier than ever. Don't forget to visit f(x)'s first international forum, Aff(x)tion!