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Demo_01 was first announced on August 25, 2017 with a release date of September 6. Beginning on August 29, various teasers were unveiled in order to promote the mini-album. A set of teaser photos of each member, as well as a group shot, were published.
Commercial performance
On the chart dated September 3–9, 2017, Demo_01 debuted at number eight on South Korea's national Gaon Album Chart. By the end of the month, the record shifted 13,759 units domestically.
^ Choi, Jeong-min (August 25, 2017). 펜타곤, 새 앨범 'DEMO_01' 컴백 스케줄 티저 공개. 10asia (in Korean). Korea Entertainment Media. Archived from the original on November 7, 2017. Retrieved November 2, 2017.
