Woolim Entertainment has revealed a mysterious photo of INFINITE's Sungjong.

Previously released photos featuring members L, Sungyeol, Sunggyu, Dongwoo, and Woohyun as well as a video teaser have left fans speculating if there's any connection between the releases.

The agency posted the following message on the group's official Twitter: "October 27, 2012. Saturday. Today's raining. Take a look at Sungjong's photo, and have a great weekend. Please look forward to the final image tomorrow."

What is intriguing about the photos is that each member is holding up a sign with a different syllable. So far, L's says "Na", Sungyeol's says "Neung", Sunggyu's reads "Dae", Dongwoo "Se", Woohyun "Yo", and Sungjong "Bak". Hoya's photo has yet to be released, and fans are still guessing the complete message.

What do you think it could be?