F(x)’s album Red Light was released in 2014 and reached #1 in Korea and #2 on the US World Chart. Their 2015 album 4 Walls also reached #1 in Korea and on the US World chart. The group has had #1 hits with the singles “Nu ABO”, “Pinocchio (Danger)”, “Electric Shock”, and “Rum Pum Pum Pum”. Amber Liu released her debut solo album Beautiful in 2015 and the album reached #2 in Korea and on the US World chart. She has had success with the singles “Shake That Brass” (featuring Taeyeon) and “Wave” (with Luna featuring R3hab & XaviGi).