On August 24 KST, Fantasy Boys unveiled a teaser image featuring its new 11-member lineup for the first time. 

Earlier on August 23, Pocketdol Studio announced the departure of Fantasy Boys member Yoo Jun Won from the team, the trainee who finished first place on the MBC survival program 'Boys Fantasy'. Pocketdol Studio cited disagreements over Yoo Jun Won's exclusive contract negotiations as the reason for his exclusion from the debut team.

Now, with a new 11-member lineup, Fantasy Boys plan to make their official debut on September 21. A special performance will also premiere on September 16 as a treat for fans. In fact, the boy group's debut was originally scheduled for September 25. But in light of recent developments, the release of the group's debut album has been moved up to September 21.