# Ong Seong-wu (옹성우)
**Ong Seong-wu** (옹성우) is a South Korean singer and actor under the agency Fantagio who first became known as a member of the project boy group [Wanna One](https://www.edgepedia.org/wanna-one), formed through the Mnet audition program *Produce 101 Season 2*, and who has since built an acting career in television, film, and theater.[1](https://produce101.fandom.com/wiki/Ong_Seongwoo) • [2](https://www.koreajoongangdaily.com/entertainment/ong-seongwu-to-hold-fan-meeting-in-julynbspticket-sales-begin-thursday/12738546) He was born in 1995 in Incheon, South Korea.[3](https://www.imdb.com/name/nm9186885/)
| Key fact | Detail |
|---|---|
| Born | 1995, Incheon, South Korea[3](https://www.imdb.com/name/nm9186885/) |
| Produce 101 Season 2 | Final rank 5th; original and reevaluation grades both A[1](https://produce101.fandom.com/wiki/Ong_Seongwoo) |
| Wanna One | Debuted August 2017; group officially disbanded December 31, 2018[1](https://produce101.fandom.com/wiki/Ong_Seongwoo) • [4](https://produce101.fandom.com/wiki/Wanna_One) |
| Solo music | Single "We Belong" (January 9, 2020); first EP *LAYERS* (March 25, 2020), six tracks with his songwriting on all[5](https://world.kbs.co.kr/service/contents_view.htm?board_seq=381149&id=&lang=k&menu_cate=) |
| Acting debut | Lead role Choi Joon-woo in JTBC's *At Eighteen* (2019)[6](https://asianwiki.com/Ong_Seong-Wu) |
| Awards | Rookie of the Year at the 2019 Korea Drama Awards and 2019 Asian Artist Awards; New Wave Award for *Life is Beautiful* at the 58th Daejong Film Awards (December 9, 2022)[7](https://www.starnewskorea.com/en/star/2026/02/09/2026020909004039426) • [6](https://asianwiki.com/Ong_Seong-Wu) |
| Agency | Fantagio; exclusive contract renewed February 9, 2026[8](https://www.soompi.com/article/1818068wpp/ong-seong-wu-renews-contract-with-fantagio) |
## Produce 101 Season 2 and Wanna One
Ong trained as a Fantagio trainee with the goal of becoming an actor before entering the audition program *Produce 101 Season 2* in 2017.[9](https://www.tenasia.co.kr/article/2019072221114) He received an A grade in both the original and reevaluated classifications and finished the finale in fifth place, earning a spot in the debut group.[1](https://produce101.fandom.com/wiki/Ong_Seongwoo)
**Wanna One.** The project group, made up of the eleven highest-ranking trainees from the finale, debuted at its Premier Show-Con on August 7, 2017, and released the EP *1×1=1 (To Be One)* the next day with the title song "Energetic".[4](https://produce101.fandom.com/wiki/Wanna_One) Within Wanna One, Ong held the positions of main dancer and lead vocalist.[4](https://produce101.fandom.com/wiki/Wanna_One) With the combined sales of its first album and its repackaged edition, the group became the first K-pop group to sell a million copies of its debut album.[4](https://produce101.fandom.com/wiki/Wanna_One) Wanna One officially disbanded on December 31, 2018, and Ong returned to Fantagio;[4](https://produce101.fandom.com/wiki/Wanna_One) • [1](https://produce101.fandom.com/wiki/Ong_Seongwoo) some later coverage dates the group's end to 2019.[2](https://www.koreajoongangdaily.com/entertainment/ong-seongwu-to-hold-fan-meeting-in-julynbspticket-sales-begin-thursday/12738546)
## Solo music
Ong released the promotional single "Heart Sign" in 2019, a collaboration with [Starship Entertainment](https://www.edgepedia.org/starship-entertainment) and Pepsi, then made his official solo debut on January 9, 2020, with the self-written single "We Belong".[1](https://produce101.fandom.com/wiki/Ong_Seongwoo) His first mini album *LAYERS* followed on March 25, 2020, containing six tracks, all with his participation in writing and composing; his agency described the album as expressing his inner experiences while growing at his own pace.[5](https://world.kbs.co.kr/service/contents_view.htm?board_seq=381149&id=&lang=k&menu_cate=) The EP runs 19 minutes 29 seconds.[10](https://music.bugs.co.kr/album/20314472) He closed the album's promotional activities with an appearance on SBS's *Inkigayo* in early April 2020.[11](https://ent.sbs.co.kr/popup/articlePrint.do?article_id=E10009872294) He also recorded "Our Story" for the soundtrack of *At Eighteen* in August 2019.[1](https://produce101.fandom.com/wiki/Ong_Seongwoo)
## Acting career
Ong had wanted to act since his university years, and after Wanna One ended he chose acting over an immediate group relaunch.[9](https://www.tenasia.co.kr/article/2019072221114) His acting debut came as the male lead Choi Joon-woo in JTBC's *At Eighteen* (열여덟의 순간, 2019), a performance that earned him Rookie of the Year at both the 2019 Korea Drama Awards and the 2019 Asian Artist Awards.[6](https://asianwiki.com/Ong_Seong-Wu) • [7](https://www.starnewskorea.com/en/star/2026/02/09/2026020909004039426)
Subsequent lead roles included Lee Soo in JTBC's *[More Than Friends](https://www.edgepedia.org/more-than-friends-tv-series)* (2020) and Kang Go-bi in Kakao TV's *Would You Like a Cup of Coffee?* (2021).[6](https://asianwiki.com/Ong_Seong-Wu) In 2022 he appeared in four films: *Life is Beautiful*, a musical film in which he played Park Jung-woo; *20th Century Girl* as Joseph; *Seoul Vibe* as Joon-gi; and *Starlight Is Falling* as Choi Kyung-soo.[6](https://asianwiki.com/Ong_Seong-Wu) His role in *Life is Beautiful* brought the New Wave Award at the 58th Daejong Film Awards on December 9, 2022.[6](https://asianwiki.com/Ong_Seong-Wu) On television he played detective Kang Hee-sik in JTBC's *Strong Girl Nam-soon* (2023).[6](https://asianwiki.com/Ong_Seong-Wu)
**Stage and recent work.** In July 2025 Ong made his theater debut in the title role of Will Shakespeare in the play *Shakespeare in Love*, drawing favorable audience reviews.[7](https://www.starnewskorea.com/en/star/2026/02/09/2026020909004039426) For 2026 he is cast as Kang Min-hwan in tvN's occult romance drama *[Spooky in Love](https://www.edgepedia.org/spooky-in-love)* (also reported under the working title *Spellbound*), opposite [Park Eun-bin](https://www.edgepedia.org/park-eun-bin) and [Yang Se-jong](https://www.edgepedia.org/yang-se-jong), and as Bae Hyeon-woo in the Netflix series *Boyfriend on Demand*.[6](https://asianwiki.com/Ong_Seong-Wu) • [12](https://www.marieclaire.com/culture/tv-shows/boyfriend-on-demand-cast/)
## Fan activities and agency
Ong's official fan club is named WELO (We Eternally Love Ong).[1](https://produce101.fandom.com/wiki/Ong_Seongwoo) In 2019 he was selected as an exclusive model for the new cosmetics brand Kat Maconie Beauty, a joint venture between the British designer brand and K-beauty.[13](https://ent.sbs.co.kr/amp/article.do?article_id=E10009580821) On February 9, 2026, Fantagio announced that Ong had renewed his exclusive contract, citing trust built over his years with the company; he told fans through his fan cafe that he still had many things he wanted to achieve with the agency.[8](https://www.soompi.com/article/1818068wpp/ong-seong-wu-renews-contract-with-fantagio) A fan meeting titled "Let's go-ONG!" was scheduled for July 25, 2026, at the Yes24 Live Hall in Gwangjin District, Seoul, with two sessions.[2](https://www.koreajoongangdaily.com/entertainment/ong-seongwu-to-hold-fan-meeting-in-julynbspticket-sales-begin-thursday/12738546)
## References
1. [Ong Seongwoo, Produce 101 Wiki (Fandom)](https://produce101.fandom.com/wiki/Ong_Seongwoo)
2. [Ong Seong-wu to hold fan meeting in July, Korea JoongAng Daily](https://www.koreajoongangdaily.com/entertainment/ong-seongwu-to-hold-fan-meeting-in-julynbspticket-sales-begin-thursday/12738546)
3. [Ong Seong-wu, IMDb](https://www.imdb.com/name/nm9186885/)
4. [Wanna One, Produce 101 Wiki (Fandom)](https://produce101.fandom.com/wiki/Wanna_One)
5. [옹성우, 전곡 자작곡 미니 1집 '레이어스' 발매, KBS WORLD](https://world.kbs.co.kr/service/contents_view.htm?board_seq=381149&id=&lang=k&menu_cate=)
6. [Ong Seong-Wu, AsianWiki](https://asianwiki.com/Ong_Seong-Wu)
7. [ONG SEONG WU renewed his contract with Fantagio, StarNews](https://www.starnewskorea.com/en/star/2026/02/09/2026020909004039426)
8. [Ong Seong Wu Renews Contract With Fantagio, Soompi](https://www.soompi.com/article/1818068wpp/ong-seong-wu-renews-contract-with-fantagio)
9. [솔로 데뷔 강다니엘·배우 데뷔 옹성우…워너원의 2막, Ten Asia](https://www.tenasia.co.kr/article/2019072221114)
10. [옹성우 1st Mini Album , Bugs!](https://music.bugs.co.kr/album/20314472)
11. [옹성우, 'LAYERS' 활동 성공적 마무리, SBS연예뉴스](https://ent.sbs.co.kr/popup/articlePrint.do?article_id=E10009872294)
12. [Meet the 'Boyfriend on Demand' Cast, Marie Claire](https://www.marieclaire.com/culture/tv-shows/boyfriend-on-demand-cast/)
13. [옹성우, '뷰티 모델' 됐다…캣 매코니 뷰티와 전속 계약, SBS연예뉴스](https://ent.sbs.co.kr/amp/article.do?article_id=E10009580821)
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*Topic: Encyclopedia › Arts and culture › Music › Music scenes › East and Southeast Asian pop scenes › K-pop and the Korean popular music scene › Artists, groups, and people: K-pop and the Korean popular music scene › Third-generation idol groups › Surnames K to S*
*Initially written Sep 17, 2026 · Reviewed: Sep 17, 2026; Sep 19, 2026; Oct 25, 2026 · Edited: Sep 18, 2026; Sep 19, 2026; Oct 12, 2026; Oct 25, 2026 · Last review: Oct 25, 2026*
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