HALO

On June 15, 2014, HISTAR Entertainment began teasing their new boy group through their SNS pages. They first revealed OOON and In Haeng, followed by Hee Cheon and Jae Yong on June 16, and finally, Dino and Yoon Dong on June 17. The company later explained the meaning behind the group's name and stated that the members had undergone rigorous training to develop their singing and dancing skills.

On June 19, they started posting teasers for the group's debut. On June 28, the group officially debuted with their first single album, "38°C". On November 20, they released their second single, "Hello HALO".

Timeline

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