SF9 have arrived at the scene of the crime in edgy individual concept photos for their 12th mini album, 'The Piece OF9'. 

Suited up in sleek, black outfits and exuding an aura of mystery, the members of SF9 have come together to solve a tough case, a secret "Puzzle" as indicated by their comeback title track. 

The boy group's full comeback is set for January 9 at 6 PM KST. Are you ready to solve the "Puzzle" with SF9?