 On August 23, 2013, Cube Entertainment released concept pictures for "When I Was Your Man", a pre-release track from the album before the official release with a special music video for the song released a few days later.On September 4, 2013, BTOB uploaded the music video of "Thriller" on their official YouTube channel and on the same day they performed "Thriller" and "When I Was Your Man" on MBC's Show Champion prior to the release date of the EP.The EP features a total of 6 tracks with 5 tracks co-written by the members of BTOB themselves and the third track of the EP titled "왜이래 (Why)" was composed and co-written by label mate Beast's Lee Gi-kwang.