4 Minute

 4Minute was announced in May 2009, along with two of the groups members, Kim HyunAh and Nam JiHyun. Although JiHyun is known as the leader, many singing parts and centered dancing roles belong to HyunAh (who is a former member of Wonder Girls). On June 11, 2009, the silhouette teaser video was released online, along with their official website.[1] The remaining three members' identities were kept secret until June 12.[2] On June 15, 2009, their debut single "Hot Issue" was released along with another teaser video and the profiles for each group member.[3] Within hours of the song release, it quickly climbed onto top five within various digital music charts such as Cyworld, Bugs, Soribada, and Mnet.[4] 4minute had their debut performances on June 18-21 with "Hot Issue" on Mnet M!Countdown, KBS Music Bank, MBC Music Core and SBS Popular Music show. They won the digital music award "Rookie Of The Month" for June and August. 4minute won their first ever number one award on Inkigayo, on September 27 and on M!Countdown, on October 1.