With the 2 idol groups, SNSD and Super Junior, already coming together for the SPAO 2010 Fall/Winter collection, YoonA and Siwon are back with a 30 second CF for fans to enjoy. It starts off with Siwon writing 'Big Hit, Warm Heat', which is the collection they're endorsing, followed by short messages and some pictures of the idols sporting some fashionable clothes from the collection, featuring�Leeteuk and Eunhyuk. Check it out below. http://www.youtube.com/watch?v=2EzxDpuEjlg