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4 Walls is the fourth full-length studio album by South Korean girl group, f(x), released on October 27, 2015 by SM Entertainment. This is the group's first release as four members since the departure of Sulli on August 7, 2015.
After a year of hiatus, it was announced, on August 7, that Sulli had officially withdrawn from the group to focus on an acting career, and that the group will continue to promote as… read more
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