F.CUZ (, "Focus"), is a South Korean boy band that used to be managed by Tunes-Will Entertainment, and is now promoting as an independent group (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 Daegeon and Raehyun in 2012. Their contract with Tunes-Will expired in September 2016, and they are now independent. The official fanclub for F.Cuz is 'For U' and their color is Twinkle Light Silver. The meaning of the group is "A five-points star" as in five members that complete F.CUZ, and "U+U = F.CUZ+FORU" as in the group and their fans being one.
History
Pre-debut
Jinon, Raehyun, Kan, and Yejun all attended the Anyang High School of Arts in Anyang; Jinon was their senior while Raehyun, Kan, and Yejun were in the same graduating class. While in Anyang, Jinon, Kan, and Yejun all participated in a dance team that had included famous K-Pop star Rain. Out of all the F.Cuz members who attended school in Anyang, Jinon had one of the busier pre-debut careers. In 2005, Jinon joined a project group named GM6, now known as Supernova, and began trainee activities. However, Jinon withdrew before their debut and suffered major health issues as a result; he battled depression and several eating disorders. Jinon also pursued acting and achieved some notoriety due to his similarities to Kwon Sang Woo. In 2009, he appeared in Cinderella Man as a younger version of Kwon Sang Woo's character. Jinon also had a role in SG Wannabe's "Gashiri" music video alongside T-ara's Eunjung.
Like Jinon, Raehyun and Kan also pursued acting. Raehyun's pre-debut career includes several dramas (Gloria, Over the Rainbow, Chosun Police (Season 3), Beautiful Life, and Rock, Rock, Rock), an appearance in the movie See You After School, and a Samyang ramen CF. Kan appeared in the dramas Soul and Assorted Gems.
LeeU had always been a witness to the music industry due to his father, the famous trot singer Sul Woon Do. From an early age, LeeU had wanted to pursue a singing career; so much so that he lost sixty pounds in one month during his first year of junior high. Later, LeeU became a successful ulzzang and appeared on many variety programs with his father. LeeU also had a short solo career under the name "U" (); he appeared on the SBS Drama Gourmet OST with "Listen to You" () and featured on a song with Taru () called "오! 다시 (Oh! Again)."
Daegeon began his idol career under Xing Entertainment, a company most known for housing future members of U-KISS, Beast, and The Boss. Daegeon eventually moved on to Golden Goose Entertainment and debuted as a member of Double B 21, now known as Apeace. He participated in their S.O.S. promotions, but left the group shortly after.
2010: Jiggy, No One, overseas activities, and Gorgeous
F.Cuz was officially announced by CAN&J Entertainment on December 6, 2009. Following the announcement, each day one member would introduce themselves to the public through a short video that showcased their talents; the videos amassed over 30,000 views. In anticipation of their debut, F.Cuz began filming the music video for "Jiggy," their debut release, on December 15, 2009. "Jiggy" was digitally released on January 8, 2010, and they held their debut performance the same day on KBS' Music Bank. In February, it was announced that F.Cuz had signed with Taiwanese label SEEDMUSIC to pursue activities overseas. On March 8, "Jiggy" was digitally released in Taiwan and Hong Kong. On March 11, 2010, F.Cuz made their Korean comeback with their first mini-album and title song "No One."