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On January 22, profile photos for the first three members: Dann, Louis, and Chiwoo, were released.
Arthur was revealed as the next member on April 17, followed by Ivan on May 29, Jahan on June 30, and Mujin on July 31.
2021: Debut with History Of Kingdom series
On the midnight of January 9, KINGDOM released their first teaser image titled "Gate Open D-40". 12 hours later, the group released the first MV teaser for "Excalibur".
In an interview with Hankyung, Ko Yoonyoung, the head of GF Entertainment, explained that the members represent the "seven kingdoms and seven kings", with the first album dealing with the story of King Arthur.