Bolbbalgan4 will be releasing a special gift song for fans!

 
Ahead of their third solo concert 'Vacation', Bolbbalgan4 will be releasing "Red Diary Hidden Track" as a special song for fans, and it will be revealed for the first time at the duo's upcoming concert. "Red Diary Hidden Track" was previously meant to be included in Bolbbalgan4's 'Red Diary Page' album.

The duo will perform "Red Diary Hidden Track" for the first time at their 'Vacation' concert on July 14-15, and the song will be officially released on the 17th.