After first releasing Chapter 1 and 2 in early September, and then Chapter 3, Chapter 4 certainly took a long time to be published with many feeling that SM Entertainment might have totally forgotten about it. After almost a month of waiting, the pictures for Chapter 4 of their gallery at f(x)'s official website have been posted on 3rd October, which by the way is Chuseok in Korea today. Chapter 4 are mostly shots that we have seen before but at least we can now call closure on this. The chameleon, Krystal looks like Kara's Goo Hara here. Many thanks to Lilly for tip.