X1

X1 (엑스원, pronounced as "Ex-One") was an eleven-member project boy group a group under Swing Entertainment and Stone Music Entertainment, formed through Mnet's survival reality show Produce X 101. They debuted on August 27, 2019, with the single "Flash".

Their special contract lasts for five years, where the first half of it is intended for them to focus solely on the group, and in the second half they will be able to do work within their own companies, such as solo debut, a member of a new group or returning to work with a former group. However, due to the Mnet vote manipulation scandal, the group disbanded on January 6, 2020 after an unsuccessful negotiation between the companies.