ONE A DAY Members Profile 2026: Debut, Members & Agency
The newer ONE A DAY is a South Korean pre-debut boy-group project linked to DAO Entertainment. Publicly available 2026 information identifies six reported members – Sangwoo, Hyosung, Shinhwa, Allan, Jerry and Jason – but an official DAO Entertainment artist page or formal debut announcement was not located during this research.
The most independently documented member is Sangwoo, formerly known as Kain, whose long K-pop career includes BLAST, Underdog, HI5 and MUSTB. A late-August 2026 Koreaboo report said he appears to be preparing for another debut with the newer One A Day under DAO Entertainment, while noting that the project had so far promoted TikTok live activity rather than a conventional music release.
That makes ONE A DAY an unusual case: the group has a reported lineup and agency association, but its official debut remains unconfirmed.
Quick Overview
| Field | Verified information |
|---|---|
| Group | ONE A DAY (원어데이) |
| Type | South Korean boy group / pre-debut project |
| Agency | DAO Entertainment – reported/secondary-source supported |
| Reported 2026 lineup | Sangwoo, Hyosung, Shinhwa, Allan, Jerry, Jason |
| Members publicly covered in stronger detail | Sangwoo |
| Official debut date | Not publicly confirmed |
| Debut release | Not publicly confirmed |
| Fandom name | Not publicly confirmed |
| Official group colors | Not publicly confirmed |
| Current status | Pre-debut / upcoming project |
| Latest public development | Sangwoo linked to the project in August 2026 |
| Known music release | None verified for the newer 2026 project |
KProfiles currently lists the newer ONE A DAY under DAO Entertainment with six members and an unknown debut date. That source is useful for identifying the emerging lineup, but it is still a reference database rather than a company announcement.
Table of Contents
Who Is ONE A DAY?
The 2026 version of ONE A DAY is a pre-debut boy-group project associated with DAO Entertainment. Current public listings identify six members, but the group’s official corporate and artistic documentation remains limited compared with established K-pop acts.
The project recently gained wider attention because of Sangwoo, a veteran idol preparing for another group debut after more than a decade of activities. Koreaboo reported on August 28 that the former MUSTB member appears to be preparing to debut with a new One A Day under DAO Entertainment.
The same report said One A Day had been promoting TikTok live events, while it remained unclear when, or even whether, the project would move into the typical cycle of music releases, broadcast stages and album promotions.
That is why KpopBio is treating ONE A DAY as pre-debut, not as an already debuted group.
A Crucial Detail: ONE A DAY Is Also an Older Group Name
Searches for “ONE A DAY” easily produce information about a completely different earlier project.
The older ONE A DAY was formerly known as CNT and was documented as a four-member pre-debut South Korean boy group. KProfiles lists that lineup as Sangwoo, Sangmin, Seonghun and J, with social activity becoming inactive around 2020. Kpop Wiki likewise describes that earlier project as a cancelled or presumed-disbanded pre-debut group.
The distinction is especially important because Sangwoo appears in both records. Current KProfiles information explicitly describes the 2026 Sangwoo as belonging to a different ONE A DAY from his earlier 2019–2020 association.
For search and editorial accuracy, KpopBio should therefore avoid combining the two lineups into a single biography.
How ONE A DAY Was Formed
There is not enough reliable public documentation to provide a conventional agency-style formation history for the 2026 group.
What can be established is that the project is currently listed under DAO Entertainment, with six reported members and no confirmed debut date.
The project’s recent public visibility appears to have been driven largely by social-media activity. Koreaboo reported that TikTok live streams were being promoted, but no conventional album-launch timetable had been confirmed.
This is an important distinction from a traditional pre-debut announcement campaign. At this point, there is evidence of a project and reported lineup, but not enough primary documentation to reconstruct exactly when DAO Entertainment formed the group, when each member joined, or whether the current six-member lineup is final.
Official Debut
ONE A DAY has not been publicly documented as officially debuted in the sources reviewed for this article.
KProfiles currently lists the debut date as unknown.
Koreaboo’s August 28 report similarly described Sangwoo as preparing for another debut and said it was unclear when, or whether, the group would follow a conventional boy-group music-release schedule.
Accordingly, KpopBio does not assign ONE A DAY a debut date, debut single, title track or official fandom name.
ONE A DAY Members
The following six names are the current reported lineup listed by KProfiles. Because no accessible official DAO Entertainment member page was located, member-specific information beyond the names should be treated cautiously unless independently verified.
| Member | Publicly listed name | Official role | Birth date | Status of available information |
|---|---|---|---|---|
| Sangwoo | Sangwoo | Not officially documented | Jan. 5, 1994 | Strongest publicly documented member |
| Hyosung | Hyosung | Not officially documented | Not publicly verified | Reported lineup member |
| Shinhwa | Shinhwa | Not officially documented | Not publicly verified | Reported lineup member |
| Allan | Allan | Not officially documented | Not publicly verified | Reported lineup member |
| Jerry | Jerry | Not officially documented | Not publicly verified | Reported lineup member |
| Jason | Jason | Not officially documented | Not publicly verified | Reported lineup member |
I have deliberately left out unofficial positions such as leader, main vocalist or rapper. The current evidence does not establish them.
Sangwoo
Stage name: Sangwoo
Birth name: Oh Sangwoo
Birthday: January 5, 1994
Nationality: South Korean
Former stage name: Kain
Reported current group: ONE A DAY
Sangwoo is by far the best-documented member of the current project. KProfiles lists his birth name as Oh Sangwoo, gives his birthday as January 5, 1994 and identifies him as a South Korean artist.
His earlier career is unusually long. He was associated with multiple groups and pre-debut projects, including Pure Boy, BLAST, Underdog and HI5, before debuting as Sangwoo in MUSTB in 2019.
Koreaboo’s August 28 report is the strongest recent independent coverage connecting him to the newer One A Day. It describes the project as his apparent next debut under DAO Entertainment and highlights the fact that the current group has been promoting TikTok live activity.
That career history is what gives the current ONE A DAY project most of its immediate public interest. Rather than being simply a newly announced rookie group, it is also the latest chapter in a veteran idol’s unusually long series of attempts to maintain a career in the industry.
KpopBio cannot, however, call his One A Day debut official yet. The available reporting uses language such as “preparing” and “seems to now be debuting,” while the current pre-debut listing still gives the debut date as unknown.
Hyosung
Stage name: Hyosung
Role: Not publicly verified
Birth date: Not publicly verified
Hyosung is listed as one of the six members of the 2026 ONE A DAY project under DAO Entertainment.
At present, however, the public record is too limited to responsibly provide a detailed biography, birth date, training history or officially assigned position. Searches for an independently authoritative member profile did not produce sufficient evidence to establish these details.
For KpopBio, the correct approach is therefore to identify Hyosung as a reported lineup member while avoiding invented biography.
Shinhwa
Stage name: Shinhwa
Role: Not publicly verified
Birth date: Not publicly verified
Shinhwa is also listed in the reported six-member lineup.
No sufficiently reliable primary source was located during this review that establishes Shinhwa’s full name, birthday, official position or pre-debut history within the current group.
Because the name Shinhwa is also strongly associated with the established Korean boy group of the same name, KpopBio should use the full phrase “ONE A DAY’s Shinhwa” where necessary to avoid entity confusion.
Allan
Stage name: Allan
Role: Not publicly verified
Birth date: Not publicly verified
Allan appears in the current reported ONE A DAY lineup supplied by KProfiles.
Beyond the listing itself, the public evidence is insufficient to build a trustworthy long-form biography. There is no reason to invent an education history, trainee period, nationality or assigned group position.
Jerry
Stage name: Jerry
Role: Not publicly verified
Birth date: Not publicly verified
Jerry is listed as one of the six members of the 2026 ONE A DAY project.
As with Allan and Shinhwa, the main limitation is not a lack of potential information online but a lack of reliably attributable information. The available search results do not provide enough evidence for KpopBio to state a full biography as fact.
Jason
Stage name: Jason
Role: Not publicly verified
Birth date: Not publicly verified
Jason completes the currently reported six-member lineup.
No trustworthy primary biography for this member was located during the research. KpopBio should therefore keep the profile limited to the verified lineup identification until DAO Entertainment or the member himself publishes additional information.
Career Timeline
| Date | Development | Confidence |
|---|---|---|
| 2019 | A different, older ONE A DAY project was associated with Sangwoo | Confirmed in reference records |
| 2019 | Sangwoo debuted with MUSTB | Strongly documented |
| 2023 | MUSTB entered a long-term inactive/temporary-disbandment phase | Reported |
| 2026 | A new ONE A DAY project is listed under DAO Entertainment | Reported |
| July–August 2026 | Project appears in current pre-debut listings | Reported |
| Aug. 28, 2026 | Koreaboo reports Sangwoo preparing to debut with new One A Day | Reputable secondary report |
| Sept. 2026 | Six-member pre-debut listing remains active; debut date unknown | Current secondary reference |
The timeline demonstrates why the group’s history should not be presented as a straightforward 2026 debut story. ONE A DAY existed as an earlier pre-debut name, and Sangwoo’s association with the earlier project predates his current connection to the newer lineup.
Music and Major Releases
ONE A DAY Discography
At the time of this review, no official music release from the newer 2026 ONE A DAY project has been verified.
That does not mean the group will not release music. It simply means KpopBio has not found enough authoritative evidence to list a song, album or official debut release as part of the current group’s discography.
| Release | Type | Date | Status |
|---|---|---|---|
| No verified 2026 release | – | – | No official release established |
The newer project’s public promotion has instead been associated with TikTok live activity, according to the August 28 Koreaboo report.
Major Achievements
Because ONE A DAY has not yet been verified as a debuted music act, there are no confirmed awards, chart wins, album sales records or music-show trophies to attribute to the group.
The standout story is currently the experience of Sangwoo, whose career spans multiple group projects and a MUSTB debut before his reported return to pre-debut activities with the new One A Day.
That should be treated as an individual career milestone, not a group achievement.
Why ONE A DAY Is Getting Attention
The current group’s appeal is closely tied to the unusual career path of Sangwoo.
Koreaboo reported that he is preparing for another debut at age 32, after earlier group experiences and years in the K-pop industry.
The more interesting editorial point is not simply the number of groups. It is the changing definition of what a “debut” looks like for smaller idol projects. The newer ONE A DAY appears to be using social platforms – particularly TikTok live activity – before establishing a conventional album-centered promotion cycle.
That makes the project worth following, but it also means readers should avoid assuming a conventional debut timetable until DAO Entertainment provides one.
Latest Verified Updates
Last Updated: September 14, 2026
The latest reliable development located during this review is that the new ONE A DAY remains documented as a pre-debut group under DAO Entertainment, with six reported members and an unknown debut date.
The newest major independent coverage is Koreaboo’s August 28, 2026 report linking former MUSTB member Sangwoo to the new group and noting the project’s TikTok-focused pre-debut activity.
No official debut date or music release was located.
What We Verified
- The 2026 ONE A DAY is listed as a South Korean pre-debut boy group.
- DAO Entertainment is the reported label/company associated with the project.
- The currently listed lineup is Sangwoo, Hyosung, Shinhwa, Allan, Jerry and Jason.
- Sangwoo is a former MUSTB member and was previously known as Kain.
- Recent reporting connects Sangwoo to the newer One A Day project.
- The newer group has not yet been given a verified official debut date in the sources reviewed.
What Is Not Officially Confirmed
The following should not be published as definite facts without stronger evidence:
- official debut date
- debut song or album
- final lineup confirmation from DAO Entertainment
- official member positions
- fandom name
- official group colors
- full biographies of Hyosung, Shinhwa, Allan, Jerry and Jason
- whether the group’s current six-member lineup is final
- whether TikTok activity will lead directly to a conventional music debut
This is an important difference between a reliable pre-debut profile and a profile assembled by copying a fan database.
Official Accounts and Sources
No independently verified official DAO Entertainment website or official ONE A DAY artist page was located through the web research available for this article.
KProfiles currently provides social-account information for the older 2019–2020 ONE A DAY project, including one_a_day_official on Instagram and oneaday_official on TikTok. Because that record belongs to the earlier group, those accounts should not automatically be presented as the official accounts of the newer 2026 lineup.
That distinction is particularly important for readers searching for ONE A DAY on social platforms.
Frequently Asked Questions
Is ONE A DAY a K-pop group?
Yes, the newer ONE A DAY is currently documented as a South Korean pre-debut boy-group project.
Who are the ONE A DAY members in 2026?
The currently reported six-member lineup is Sangwoo, Hyosung, Shinhwa, Allan, Jerry and Jason.
What agency is ONE A DAY under?
The group is currently listed under DAO Entertainment, although the strongest accessible evidence is a secondary pre-debut listing rather than a directly accessible official agency artist page.
Has ONE A DAY debuted?
The newer 2026 ONE A DAY has not yet had a publicly verified official debut in the sources reviewed.
Who is Sangwoo in ONE A DAY?
Sangwoo is a veteran Korean idol who previously performed as Kain and later debuted with MUSTB. Recent reporting connects him to the newer One A Day project.
Is the 2026 ONE A DAY the same group as the older ONE A DAY?
No. Public profile records identify them as separate projects. The older group was a pre-debut lineup from around 2019–2020, while the current project is associated with DAO Entertainment in 2026.
What was Sangwoo’s previous stage name?
Sangwoo previously used the stage name Kain.
What group did Sangwoo debut in?
He later debuted as Sangwoo in MUSTB in 2019.
Does ONE A DAY have a debut date?
No verified date has been published in the sources reviewed. KProfiles currently lists it as unknown.
Does ONE A DAY have a fandom name?
No officially confirmed fandom name was located.
Does ONE A DAY have an album?
No official album release from the newer 2026 project was verified.
What is ONE A DAY’s latest update?
The latest significant development is Sangwoo’s reported preparation for a new debut with the DAO Entertainment project.
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