ALLDAY PROJECT (Hangul: 올데이 프로젝트; also stylized as ADP) is a five-member co-ed group under THEBLACKLABEL. The group consists of ANNIE (애니), TARZZAN (타잔), BAILEY (베일리), WOOCHAN (우찬), and YOUNGSEO (영서). They made their debut on June 23, 2025 with the single album "FAMOUS".

Their fandom name is: DAY ONE (데이원).

Group History: On June 6, 2025, it was reported that THEBLACKLABEL was currently preparing to debut a co-ed group produced by Teddy. Hours later, a representative from the agency confirmed the report and added that details would be revealed at a later date. The same day, it was revealed that ILLIT pre-debut member Lee Youngseo had signed with the agency and is expected to make her debut soon with the co-ed group.

On June 9, THEBLACKLABEL opened official SNS accounts for ALLDAY PROJECT, scheduled to debut on June 23. The members revealed themselves via their personal Instagram account with the lineup consisting of Youngseo, Annie, Bailey, Woochan and Tarzzan.

On June 10, 2025, it was announced that ALLDAY PROJECT would make their debut with their first single album "FAMOUS" on June 23. On June 16, the group released the pre-debut music video for "FAMOUS". They officially released "FAMOUS" alongside the second single, "WICKED", on June 23, 2025. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.