ONF
韓國 Official roster: 6（5 birthdays recorded）
member Birthdays
| Birthday | member | Other spellings |
|---|---|---|
| April 22 | HYOJIN （김효진） | HYOJIN, Kim Hyo-jin, ヒョジン |
| December 24 | E-TION （이션） | Lee Chang-yun, イーション |
| January 13 | SEUNGJUN （제이어스） | J-US, Lee Seung-jun, ジェイアス |
| January 23 | WYATT （심재영） | Shim Jae-young, ワイアット, 와이엇 |
| March 16 | Mizuguchi Yuto （유토） | Mizuguchi Yuto, U, YUTO |
Roster source: ONF | プロフィール | ビクターエンタテインメント (obtained 2026-08-30)
An official roster page exists but has incomplete fields or appears outdated; this site marks it as pending update.
member Age Ranking
This site has birth-year data for 5 out of 5 member (member with only month/day and no birth year are excluded, as age cannot be calculated). Oldest: HYOJIN (32 (in 2026; 31 before April 22)); youngest: Mizuguchi Yuto (27 (in 2026; 26 before March 16)).
| Rank | member | Birthday | Age |
|---|---|---|---|
| 1 | HYOJIN | April 22, 1994 | 32 (in 2026; 31 before April 22) |
| 2 | E-TION | December 24, 1994 | 32 (in 2026; 31 before December 24) |
| 3 | SEUNGJUN | January 13, 1995 | 31 (in 2026; 30 before January 13) |
| 4 | WYATT | January 23, 1995 | 31 (in 2026; 30 before January 23) |
| 5 | Mizuguchi Yuto | March 16, 1999 | 27 (in 2026; 26 before March 16) |
This page lists all 6 member per ONF's official roster; 5 of them have an individual page on this site (our inclusion criterion is "has anyone held a support event for them, or is there a verifiable identity/birthday source"). The rest are marked "roster-only entry" — listed in this table only, with no individual page. Birthdays are listed only when a verifiable source is found; otherwise marked "no verifiable source obtained," never filled in by guesswork. Found an error, or have a verifiable official source? Please email service@joelin.cc. (open a report email)
Want to hold a support event for ONF?
Group support is commonly held around debut anniversaries and concerts, with member birthdays each following the dates in the table above.
How & where to hold a photo booth event → Custom photo booth frame / full-booth booking →
FAQ
- What are the birthdays of ONF's member?
- ONF's official roster has 6 member in total; the ones with a verifiable birthday on this site are:HYOJIN April 22, E-TION December 24, SEUNGJUN January 13, WYATT January 23, Mizuguchi Yuto March 16. 1 more member do not yet have a verifiable birthday source on this site, so they are not listed. Every birthday's source is cited both on this page and on the individual's own page.
- How many member of ONF are on this site?
- ONF has Official roster: 6, of whom 5 have a verifiable birthday recorded on this site. This page lists all 6 member per ONF's official roster; 5 of them have an individual page on this site (our inclusion criterion is "has anyone held a support event for them, or is there a verifiable identity/birthday source"). The rest are marked "roster-only entry" — listed in this table only, with no individual page. Birthdays are listed only when a verifiable source is found; otherwise marked "no verifiable source obtained," never filled in by guesswork. Found an error, or have a verifiable official source? Please email service@joelin.cc.
- What is the age order of ONF's member? Who is the oldest?
- Among ONF's member, this site has birth-year data for 5 out of 5(member with only month/day and no birth year cannot have an age calculated, and are excluded from the ranking.) Ordered from oldest to youngest: HYOJIN（32 (in 2026; 31 before April 22)）, E-TION（32 (in 2026; 31 before December 24)）, SEUNGJUN（31 (in 2026; 30 before January 13)）, WYATT（31 (in 2026; 30 before January 23)）, Mizuguchi Yuto（27 (in 2026; 26 before March 16)）. The oldest is HYOJIN, and the youngest is Mizuguchi Yuto.
View this page in Chinese → Back to group index Birthday calendar