U-KISS are gearing up for their upcoming return as six, and they pre-released "Mysterious Lady" to get fans ready for what's coming.

SEE ALSO: U-KISS returns to fans ahead of comeback with pre-release track 'Mysterious Lady'

In celebration of the pre-release, the members posted a few behind-the-scenes selcas on Twitter. From the photos, it looks like U-KISS may be rocking suits for their upcoming concept.