7 days ago 
Changsub released concept images for 'Mark.'
The vocalist of BTOB is coming with his first solo mini album. After the comeback schedule and tracklist are the concept images for the new release. In a dandy suit, Changsub is captured staring into his own reflection through the mirror on the floor.
'Mark' is scheduled to fully release on December 11.
1
He looks so handsome in these pictures! Can't wait for the album to come out!