On September 12th, vocal group V.O.S (Voice of Soul) unveiled a MV teaser for their upcoming comeback, and it's been gaining a lot of netizen interest. Released through GomTV, the 30-second teaser reveals the title track,"Full Story." The video also gives a sneak peek of the upbeat, harmonious song: http://www.youtube.com/watch?v=g9lmAvJzWKc V.O.S, originally a three-member group, lost its member Park Ji Hyun last August. Because only two of the V.O.S members (Choi Hyun Joon and Kim Kyung Rok) can be heard in the teaser, many fans and netizens are wondering if the group will be making their comeback as a duo. Some are even speculating that the group will add a new member, thus making V.O.S. a trio once more. V.O.S's agency, Star Empire Entertainment, stated, "Their song 'Full Story' expresses V.O.S's feelings as they look back at the seven years since they've debuted. ... Regarding the inquiries which rose from the MV teaser, it will all be answered when the full version of the MV is released." Meanwhile, V.O.S will release their song in stores on September 16th, and online through music portal sites the next day.