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Red Light is the third full-length album by f(x). It was released on July 7, 2014 with "Red Light" serving as the album's title track. The track "Milk" was also used during promotions. This was the group's last album with member Sulli. The album's concept is darker than the ones the group has shown before. The members expressed their happiness of being able to show another side of them in various interviews. The title track "Red Light" has been described by Naver as a "blast of urban rhythm bit, reversal in electro house genre". The lyrics talk about capturing great moments, stop and reconsider what is important in life. It is a also message, using a "red light" to symbolize the warning.