It has been reported that Secret member Song Jieun, will have an official debut as a solo artist aside from her fellow members on December 15th... Well, maybe "solo" is not the right word, since it is going to be a duet with Fly to the Sky's Hwanhee. The song will be called Yesterday and its first teaser has already been released through GomTV. There will be two more teasers prior to the songs' actual release. The harmony between Song Jieun's vibrant sound and Hwanhee's charismatic voice are expected to blow minds. Can't wait? For more on Secret, visit SecretFour.