YULiONi (유리오니; formerly know as DAONBIN (다온빈)) is an upcoming four-member girl group. The date of their debut is currently unknown.
On July 17, 2018, Baby Boo's official Instagram and Twitter account's names were changed from "Baby Boo" to "DAONBIN". The two members left the group and company in August 2018 and reformed as a duo, managing to keep their original accounts.
In early 2019, the group rebranded to "YULiONi" for unspecified reasons. The duo's first post to include the new name was uploaded on February 2, of the same year.
In April, the duo was joined by two other former Baby Boo members: Hajin and Roori (Jelly).