The boys of TO1 are ready to cause some serious trouble with their comeback mini album, 'UP2U'!

In their latest set of individual' Troublemaker' version concept photos, the members of TO1 bring out their wild, unpredictable attitudes, somewhat mismatching in their neat and dandy prep school attire. Fans can look forward to TO1's signature, youthful energy once again when the boys return with their brand new album, 'UP2U'. 

TO1's 4th mini album comeback is set for later this month on November 23 at 6 PM KST.