X1 (엑스원) was an 11-member project boy group under Swing Entertainment and Stone Music Entertainment. They were formed through Mnet's competition reality show Produce X 101 and debuted on August 27, 2019 with their first mini album 비상 : Quantum Leap. The group disbanded on January 6, 2020 after the agencies representing the members could not reach an unanimous agreement following the Produce 101 vote manipulation controversy.
