BTOB invited fans to solve a 'photo quiz'.
The image doesn't show much except an emergency exit sign. There's no hint to what the photo is for, either. However, we do know that Ilhoon is gearing up for his first ever solo album in March.
SEE ALSO: [PHOTOS] BTOB express enthusiasm about finally meeting fans through 'Our Dream' fan concert tour
What do you think the photo could be for?
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