Showcasing their friendship along with their vocal skills, f(x)'s Amber featured in one of the tracks from Ailee's latest album titled 'Vivid'.
Here's their wonderful song titled 'Letting Go'~
Release Date: June 28, 2016
Release Date: July 5, 2016
Release Date: May 17, 2016
Buy SNSD's 'Phantasia in Japan' DVD/Blu-ray