The new song by GB9 - the best vocal duo in Korea – is finally unveiled.

GB9 released their new single "Unforgettable" on various music sites at 6 p.m. on Dec. 6.

‘Unforgettable’ is a ballad that goes well with the lonely and cold season. It is a song that tries to forget it after breaking up with a lover, but finally captures the lingering afterglow of a man who is suffering from longing.

In particular, member Bong-Gu participated in the production for the first time, raising the level of perfection, and lyrical melodies and GB9's unique sensibility and explosive singing will harmonize with fantasy to captivate risers.

In addition, GB9 will host their first national tour in Busan and Seoul, starting in Daegu on Jan. 4, 2020, and meet fans from all over the country.

GB9 is expected to offer unforgettable memories to audiences who visit the scene with such beautiful stages as love, separation, longing and one drama that leads to love again.