O.de

On November 1, 2021, a teaser was revealed, containing the phrase "Heroes Are Coming" sparking rumors that JYP Entertainment would be debuting a new group soon. On November 16, O. de was revealed as the band's second member.

On November 23, JYP Entertainment released a performance video of O. de, showing him playing the synthesizer. They made their debut on December 6, 2021 with the digital single "Happy Death Day".