'K-Pop Star 3' Nam Young Joo has surprised many people with her new sexy image transformation through teaser photos for her upcoming debut single.

JJ Holic Media updated Nam Young Joo official Facebook with a message,"2014.09.15 #NamYoungJoo first single '#6:09' will be released" and uploaded along some teaser photos.

'6:09' is said to be a medium tempo R&B track which is produced by Lee Jae Eun who previous worked on Yurisangja's Lee Se Jun's solo album. In particular, it was revealed that Nam Young Joo directly involved in the lyrics writing of the song, raising the expectation towards her upcoming debut.

'6:09' will be released on September 15th.