A male idol groups in Korea gained popularity in the early 90, former member of H.O.T, Tony Ahn. The dancing male vocal group of SMASH.

In English, it's meand "move forward", "overcome" and others, so that a group called rush forward aggressively. They original version made its debut in 2008 in Korea with 6 members, they are World (Nam Hyun Joon), Cheonwoo (Lee Jin Young), Jerry (Shim Min Gyu), Naru (Joo Young Seok) and Hero (Kim Min Soo).

Mini album debut "OPEN FIRE!", including the Grammy Award winner Richard Anderson, WESTLIFE, Celine Dion, Thomas Ahlstrand worked on an album of Britney Spears, Bryan Todd made such famous foreign Words, the composer attended. Applications such as quarterback coach, rookie debut as a group on a scale unprecedented.

Become a hot topic in the response than anticipated event was held in Japan in April and September 2009. In October 2010, They decided to debut in Japan after they lost one of member, Cheonwoo.