Double 0ne (더블원) is an 11-member South Korean project boy group formed by PocketDol Studio, featuring artists from the existing groups BAE173 and FANTASY BOYS. The group officially debuted on June 12, 2025 with the mini album Xpert. The lineup includes Yoojun, Muzin, Junseo, Youngseo, Doha, and Bit from BAE173, and Kang Min Seo, Lee Han Bin, Hikari, Ling Qi, and Hong Sung Min from FANTASY BOYS. Members J-Min and Hangyul from BAE173 did not participate—J-Min focused on activities with CLOSE YOUR EYES, while Hangyul prepared for POLARIX’s debut. Plans for the collaboration were first revealed in January 2025, and by March, teaser clips hinted at their track titled "On the Rocks with Kiss". Ahead of their debut, the unit also released two promotional tracks: "Reserved" by BAE173 and "Toxic Lips" by FANTASY BOYS.
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