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Ong Seong-wu (, born August 25, 1995) is a South Korean singer and actor. He is known for his participation in the survival reality show Produce 101 Season 2, where he finished in fifth place, and is a former member of the show's derivative boy group Wanna One. Following Wanna One's disbandment, Ong made his acting debut with the drama At Eighteen (2019) directed by Shim Na-yeon. He also established his career as a solo artist with the release of his first extended play, Layers, on March 25, 2020.
Ong was encouraged by his mother to pick up a musical instrument and started playing the drums after his sister began learning the piano. While playing the drums at a band contest in 2008, Ong was scouted as a trainee by the now-defunct entertainment company Lion Media. However, internal troubles with the company and its eventual closure lead to the delay of his debut, and contractual issues prevented him from signing with other companies for a period of time . In August 2016, he signed as an acting trainee with his current company Fantagio at the recommendation of one of his university professors.
Prior to his participation in Produce 101, Ong took part in a short film project Short Film Project: Beginning. The short film, titled Seong-wu Is Alright, was released on June 19, 2017. Additionally, he made a special appearance on the mobile drama Idol Fever, which aired between July 7 to July 17, 2017.
In November, Ong featured in singer Huh Gak's music video for his digital single "Only You". In February 2018, Ong was named one of the main emcees of Show! Music Core. He subsequently left his position in September 2018. He also continued appearing on several variety shows. He appeared on Living Together in Empty Room with Kang Daniel and Kim Jae-hwan, and also became a cast member of the reality show Law of the Jungle Sabah, with his fellow group mate Ha Sung-woon, which aired from July 27, 2018, to September 21, 2018.
His contract with Wanna One ended on December 31, 2018. However, he continued to appear with the group until its official farewell concerts on January 24–27, 2019.
As part of Pepsi and Starship Entertainment's 2019 Pepsi K-Pop Collab Project, Ong released the single "Heart Sign". The track was written by producers Flowblow, who penned Wanna One's hit debut single, "Energetic". The music video was released on June 11, 2019.
Ong made his acting debut in the later half of the year, starring as the male lead in JTBC's youth drama At Eighteen, alongside Kim Hyang-gi and Shin Seung-ho. The drama tackles some of the issues faced by youths in South Korea, such as first love, the pressures of school and parental expectation, to topics such as school violence and bullying. Ong played the role of transfer student Choi Jun-woo, who is falsely accused of school violence. He garnered many positive reviews for his emotive acting, and went on to nab several awards for the role, including Best Rookie Award and Hallyu Star Award at the Korea Drama Awards. and made Ong nominated at the 56th Baeksang Arts Awards. In the Best New Actor – Television category. Ong also recorded the song "Our Story" as part of the official soundtrack for the drama, which was released on August 8, 2019. In January 2020, Ong kicked off his second solo fan-meeting tour, titled "We Belong". The digital single "We Belong" was released on January 9. Intended as a fan-song, Ong participated in both the lyric writing and composition of the single, and performed it on the first time during the Seoul leg of his tour on January 11.
Ong appeared on the second season of travel variety show, Traveler, with fellow actors Ahn Jae-hong and Kang Ha-neul. The variety show focused on the backpacking travels of the trio in Argentina, and began airing starting February 15. He went received much attention for his photography skills on the first episode.
Ong made his comeback as a singer with his first solo album, Layers. The EP was released on March 25, together with lead single, "Gravity". Ong took part in the composition and lyric writing of all the songs on the album, drawing his inspiration from his emotions and stories from the past year.
He also made several appearances on variety shows, including Omniscient Interfering View, as well as Master in the House, Radio Star, and Running Man. He also featured on You Hee-yeol's Sketchbook, performing his new single and displaying his drumming skills on the show's live music format.
Ong collaborated with singer Baek Ji-young on the duet "Didn't Say Anything". The ballad was released on May 12.
Ong began starring as the male lead in the JTBC drama More Than Friends, alongside Shin Ye-eun and Kim Dong-jun, playing photographer Lee Soo. The drama premiered 25 September. The song "Late Regret" was recorded and released by Ong as part of the drama's soundtrack.
Furthermore, Ong will also be making his film debut in the upcoming musical-movie, Life is Beautiful, starring Ryu Seung-ryong and Yum Jung-ah. The film will go to theatres in second half of 2022. Ong will also star in the movie, Jung's Ranch with Ryu Seung-ryong and Park Hae-joon. This will mark his second collaboration with Ryu.
In 2021, Ong has been confirmed to appear in the drama Shall We Have A Cup of Coffee? It airs on KakaoTV and is confirmed to join the Netflix film Seoul Vibe, which is expected to air in 2022. Ong appeared alongside dancer, Noze, in Lee Seung-hwan and Sunwoo Jung-a's music video for the song "How could you", released on November 18, 2021.
In 2022, Ong announced that the fan meeting 'RE:MEET' will be held for the second time in March 2022, which will be held offline and online.
In 2025, Ong will participate in the play Shakespeare in Love as Shakespeare.
| "—" denotes releases that did not chart or were not released in that region. |
| "—" denotes releases that did not chart or were not released in that region. |
| Life Is Beautiful | Jung-woo | ||
| 20th Century Girl | Poong Jun-ho / Joseph | Cameo | |
| Starlight Falls | Choi Kyung-soo |
| Master Key | Cast member | with Kang Daniel | |
| Show! Music Core | Co-host | with Kang Mi-na and Mark Lee | |
| Law of the Jungle Sabah | Cast member | with Ha Sung-woon | |
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