4 Walls

4 Walls is the fourth studio album by South Korea-based girl group f(x), released by S.M. Entertainment on October 27, 2015. Lee Soo-man, former president of S.M. Entertainment, served as the executive producer of the album. It marked the group's first release as a four-member group after former member Sulli left the group in August 2015.

4 Walls

4 Walls is the fourth studio album by South Korea-based girl group f(x), released by S.M. Entertainment on October 27, 2015. Lee Soo-man, former president of S.M. Entertainment, served as the executive producer of the album. It marked the group's first release as a four-member group after former member Sulli left the group in August 2015.