|On July 30, 2014, Big Hit Entertainment launched a countdown clock on BTS' official website, and on August 5, they uploaded a comeback trailer on YouTube which featured contrasting scenes. One scene from the trailer featured a forest paradise, while another showed black and white abandoned structures accompanied with lyrics from a Rap Monster verse. On August 7, 2014, the company released the first teaser photos and the concept photo for the new album.
BTS also released a B-Side Song titled “Let Me Know” for free streaming, which was composed and produced by Suga. The company later released the album's tracklist on the group's official Facebook and Twitter pages. It confirmed that there were 14 tracks, with "Danger" circled in red, indicating that it was the title song. Big Hit Entertainment later released two music video teasers for the lead single "Danger". BTS also later released an audio preview of their album on the group's SoundCloud page which featured short excerpts from the tracks that made up the album with harder hip-hop tracks, R&B sounds and electronica elements interspersed. On October 21, BTS released 19 concept photos of the follow-up song "War of Hormone" through their official Facebook page and Twitter account. The teaser for the remix of "Danger" was then released on November 13, as a result of collaboration with a Vietnamese singer, Thanh Bùi.