F.Cuz (, "Focus"), is a South Korean boy band managed by Tunes-Will Entertainment (before 2014 by CAN Entertainment). The group made their debut on January 8, 2010 with their first single, "Jiggy" on Music Bank. F.Cuz originally debuted as a four-member group (Jinon, LeeU, Kan, and Yejun), but LeeU made his departure on August 23, 2011 to pursue a solo career. F.Cuz promoted shortly as three-member group in Japan, but were joined by new members Daegun and Raehyun in 2012. The official fanclub for F.Cuz is 'For U' and their color is Twinkle Light Silver.