B.A.P releases the title song "Goodbye" of their new upcoming mini album as a single. 

Goodbye is specially noted as it is produced by none other than TOP, the lead guitarist for Seo Taiji Band. TOP is not only the head producer, but a musician as he is featured playing a variety of instruments from guitar, bass guitar and the drums. Lyrically, Goodbye describes their encouragement for fans to "never be frightened of new beginnings" and to "keep their hopes alive for their dreams."

While B.A.P's previous singles showcased strong urban, hip-hop influences, Goodbye is rock number that shows unique musical color with the distinctive rock sound.