f(x) – 4 Walls

“4 Walls” is a song sung by the Korean girl group f(x). It is written by Jam Factory and composed by LDN Noise, Tay Jasper, and Adrian McKinnon. This song is included in the album “4 Walls” of the same name released by f(x) on October 27, 2015 as the main song of the album.