Sunday, February 18, 2018 
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: [MV & Album Review] BTOB – 'Hour Moment'
What do you think the photo could be for?
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