f(x) releases the next batch of teaser images featuring Luna

Following Victoria, Luna is the next one to release her individual teasers for '4 Walls'.

Luna shows her upgraded beauty through the retro concept, and especially she stares directly at the camera in all the photos, capturing everyone' hearts with her feminine charm.

In particular, title track '4 Walls' is said to be an EDM track of deep house genre with dreamy and sophisticated atmosphere, raising the anticipation for their comeback even more,

Meanwhile, 4th full-length album '4 Walls' will be released at midnight on October 27th.