UNB surprised fans with a teaser post on June 19 at 8 p.m. KST. This update marks their first social media activity since concluding group activities in January 2019. The teaser image showcases UNB’s logo, accompanied by the phrases “REBORN · REBOOT · REUNITE.” The post has sparked speculation about a possible reunion project. UNB was formed through the idol rebooting survival show The Unit and debuted in April 2018. The group officially concluded their activities in January 2019. Although no additional details have been provided, this teaser has fans hoping for a long-awaited reunion.