SECRET made an impressive comeback today with the help of some of the biggest names in the industry. The group showed off their powerful vocals through Mnet's "M. Countdown", and marked the first day of their official comeback with "Shy Boy." To really boost their 'retro' concept, the girls have enlisted the aid of choreographer Kang Ok Soon, who drew inspiration from musicals such as "Legally Blonde" and "The Thing About Men." Their agency, TS Entertainment, revealed, "Choreographer Kang Ok Soon took part in the group's intro comeback today.  Many musical actors have come together in support of SECRET's comeback, in order to create a true musical-like stage for the girls." Check it out below! Source + Photos: Star News via Daum