Last week, the boys of F.cuz released their new mini-album and officially began their comeback. Now the boys return to their 2nd weekend of live performances as they perform their title track No One on M! Countdown. The boys completely ditched their bubbly colorful concept and followed the "dark" trend that many idol groups seem to be following. The boys definitely seem to pull it off well as they rock it on stage. Watch below to check out the performance that overflows with charisma and style. http://www.youtube.com/watch?v=fhJh5raLmRQ And don't be surprised if you see just 3 on stage. Leader, Jinon suffered acute appendicitis earlier today during rehearsals and is now having an operation at the hospital. We wish him a speedy recovery.