4 Walls/Cowboy is the second Japanese single by f(x). The single will be released on November 2, 2016.

Track list

  1. "4 Walls" - 3:12
  2. "Cowboy" - 3:46
  3. "4 Walls (Inst.)" - 3:12
  4. "Cowboy (Inst.)" - 3:46

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