Sources at the record label confirmed the news, although it is unclear if the group will release a single, EP, or full album at that time.
Shortly after the album was released, the title song, "Chained Up", hit #1 on Mnet, Genie, Monkey3, and Naver Music.
Girls Day member Hyeri was also praised for her impressive acting skills.
The popular boy band is the first of the company's acts to receive their own subsidiary label.
Fans guessed from the teaser which group it was almost immediately.
A few well-off and lucky Chinese fans are now the proud owners of some of actor Lee Min Ho's belongings.
The rapper is gradually regaining popularity after a draft-dodging scandal.
Girl's Day's younger brother group will finally make their debut.