After the first audition in mid-2016, the first generation of the group was announced in early 2017, comprising a total of 30 members. The group officially debuted on 2 June 2017 and released the debut single on 8 August 2017. As of 9 February 2018, the group consists of 26 members.
The group is named after Bangkok, the capital city of Thailand. Orchid, a popular flower in the country, serves as both the colour and motif of the group.
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