# Lee Sung-yeol (이성열)
**Lee Sung-yeol** (이성열; born 1991), known mononymously as **Sungyeol**, is a South Korean singer and actor, a member of the boy group INFINITE and its sub-unit Infinite F.[1](https://www.koreanfilm.or.kr/eng/films/index/peopleView.jsp?peopleCd=20196297) He debuted with INFINITE on June 9, 2010 with the mini album *First Invasion*, served as the group's sub-vocalist, and has built a parallel acting career in television dramas and film since 2011.[2](https://kpopping.com/profiles/idol/Sungyeol?auth=required) • [3](https://sungyeol.jp/profile.php)
| Key fact | Detail |
|---|---|
| Born | 1991, Yongin, Gyeonggi Province, South Korea[4](https://asianwiki.com/Lee_Sung-Yeol) |
| Group | INFINITE, debuted June 9, 2010 with *First Invasion*; sub-vocalist[2](https://kpopping.com/profiles/idol/Sungyeol?auth=required) • [3](https://sungyeol.jp/profile.php) |
| Sub-unit | Infinite F, with L and Sungjong, active from 2014[5](https://music.bugs.co.kr/artist/80209728?wl_ref=S_ar_02_03) |
| Acting debut | 2011, SBS daily drama *While You Were Sleeping*, as Yun So-Joon[4](https://asianwiki.com/Lee_Sung-Yeol) |
| Notable dramas | *Hi! School - Love On* (KBS2, 2014), *D-Day* (JTBC, 2015), *Love Returns* (KBS1, 2017–2018), *Numbers* (MBC, 2023), *Iron Family* (KBS2, 2024)[4](https://asianwiki.com/Lee_Sung-Yeol) |
| Film | *0.0MHz* (2019), a Korean horror film based on a webcomic by Jang Jak, in which he played Sang-Yeob[4](https://asianwiki.com/Lee_Sung-Yeol) • [1](https://www.koreanfilm.or.kr/eng/films/index/peopleView.jsp?peopleCd=20196297) |
| Agencies | Woollim Entertainment until 2021; Management 2sang (Management Leesang) from 2021; INFINITE Company for group activities since 2023[2](https://kpopping.com/profiles/idol/Sungyeol?auth=required) • [6](https://www.thbt.vn/ca-si-nhac-pop-lee-sung-yeol/) |
| Physical profile | 183 cm; blood type B[4](https://asianwiki.com/Lee_Sung-Yeol) |
## Early life and background
Lee Sung-yeol was born and raised in Yongin, Gyeonggi-do.[1](https://www.koreanfilm.or.kr/eng/films/index/peopleView.jsp?peopleCd=20196297) His family includes parents and a younger brother, Lee Dae-yeol, who also signed with [Woollim Entertainment](https://www.edgepedia.org/woollim-entertainment) and became a member and leader of the boy group [Golden Child](https://www.edgepedia.org/golden-child-band), which debuted in August 2017.[3](https://sungyeol.jp/profile.php) • [1](https://www.koreanfilm.or.kr/eng/films/index/peopleView.jsp?peopleCd=20196297)
He trained in music formally, graduating from Daekyung University with a major in Applied Music alongside fellow INFINITE members Sung-kyu, L, Dong-woo, and [Hoya](https://www.edgepedia.org/hoya-singer).[1](https://www.koreanfilm.or.kr/eng/films/index/peopleView.jsp?peopleCd=20196297)
## INFINITE
INFINITE, formed by Woollim Entertainment, debuted as a seven-member group on June 9, 2010 with the mini album *First Invasion* and the title track "Come Back Again" (다시 돌아와).[7](https://kpop.fandom.com/wiki/INFINITE) Within the group he serves as sub-vocalist, a role his official Japanese profile describes as using his distinctive timbre to bring out the music's appeal.[3](https://sungyeol.jp/profile.php)
The group became known for precisely synchronized choreography, called "kalgunmu" (칼군무), and reached a commercial peak in 2012 with "The Chaser," which [Billboard](https://www.edgepedia.org/billboard-magazine) named the best K-pop song of that year.[8](https://kpop.openblog.com/en/artist/infinite) INFINITE made its Japanese debut in 2011, first with the single "TO-RA-WA" and officially in November 2011 with "BTD (Before the Dawn)".[3](https://sungyeol.jp/profile.php) • [7](https://kpop.fandom.com/wiki/INFINITE)
After a hiatus during the members' military service, the group resumed full-group activities under INFINITE Company, founded by the members in 2023, releasing the mini album *13egin* that year and *LIKE INFINITE* in March 2025.[8](https://kpop.openblog.com/en/artist/infinite)
## Infinite F
In 2014 Lee formed the sub-unit Infinite F with bandmates L and Sungjong.[5](https://music.bugs.co.kr/artist/80209728?wl_ref=S_ar_02_03) The trio released the single album *靑* (Blue), with tracks including "가슴이 뛴다" (My Heart Beats) and "너라서" (Because It's You).[5](https://music.bugs.co.kr/artist/80209728?wl_ref=S_ar_02_03) That same year Lee and Woo-hyun were cast in the KBS2 drama *Hi!
## Acting career
Lee's acting debut came in 2011 with *While You Were Sleeping*, an SBS daily drama in which he played Yun So-Joon.[4](https://asianwiki.com/Lee_Sung-Yeol) His television roles since then have moved between genres: An Dae-gil in the JTBC disaster drama *[D-Day](https://www.edgepedia.org/d-day-tv-series)* (2015), Hong Seok-pyo in the KBS1 daily series *Love Returns* (2017–2018), Sim Hyeong-woo in the MBC office drama *Numbers* (2023), and Choi Hyeong-cheol in the KBS2 series *[Iron Family](https://www.edgepedia.org/iron-family)* (2024).[4](https://asianwiki.com/Lee_Sung-Yeol)
On film he appeared as Sang-Yeob in *0.0MHz* (2019), the first Korean horror release of that year, adapted from a webcomic by Jang Jak and co-starring [Jung Eun-ji](https://www.edgepedia.org/jung-eun-ji).[4](https://asianwiki.com/Lee_Sung-Yeol) • [1](https://www.koreanfilm.or.kr/eng/films/index/peopleView.jsp?peopleCd=20196297) His official Japanese profile also lists musical theater among his acting work.[3](https://sungyeol.jp/profile.php)
## Agency changes and solo work
On March 31, 2021, Woollim Entertainment announced that Lee, along with fellow member Dong-woo, had left the agency after their contracts expired.[2](https://kpopping.com/profiles/idol/Sungyeol?auth=required) In June 2021 he signed an exclusive contract with Management Leesang, also known as [Management](https://www.edgepedia.org/management) 2sang, the agency of fellow INFINITE member Kim Myung-soo (L).[6](https://www.thbt.vn/ca-si-nhac-pop-lee-sung-yeol/)
He made his solo debut with the album *Asteroid* in November 2024, which his career profile describes as marking a shift from group concept work toward a personal rock/pop color and greater creative autonomy.[6](https://www.thbt.vn/ca-si-nhac-pop-lee-sung-yeol/) For INFINITE's group activities he is now listed under INFINITE Company, the agency the members founded in 2023.[2](https://kpopping.com/profiles/idol/Sungyeol?auth=required) • [8](https://kpop.openblog.com/en/artist/infinite)
## References
1. [LEE Sung-yeol, Korean Film Council (KOFIC) people database](https://www.koreanfilm.or.kr/eng/films/index/peopleView.jsp?peopleCd=20196297)
2. [Sungyeol (INFINITE) profile, kpopping](https://kpopping.com/profiles/idol/Sungyeol?auth=required)
3. [LEE SUNG YEOL Japan Official Site, profile](https://sungyeol.jp/profile.php)
4. [Lee Sung-Yeol, AsianWiki](https://asianwiki.com/Lee_Sung-Yeol)
5. [인피니트 F (Infinite F) artist page, Bugs Music](https://music.bugs.co.kr/artist/80209728?wl_ref=S_ar_02_03)
6. [Lee Sung-yeol: tiểu sử, sự nghiệp Infinite và các tác phẩm, Thbt.vn](https://www.thbt.vn/ca-si-nhac-pop-lee-sung-yeol/)
7. [INFINITE, Kpop Wiki (Fandom)](https://kpop.fandom.com/wiki/INFINITE)
8. [INFINITE member and group profile, K-POP Archive](https://kpop.openblog.com/en/artist/infinite)
---
*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 › First- and second-generation idol groups and 1990s dance acts › Surnames K to S*
*Initially written Sep 17, 2026 · Reviewed: Sep 18, 2026; Sep 19, 2026; Oct 25, 2026 · Edited: Sep 18, 2026; Oct 12, 2026; Oct 25, 2026 · Last review: Oct 25, 2026*
*Copyright 2026 EdgeChat AI, a subsidiary of Biostate AI.*
License: Edgepedia Community License 1.0, https://www.edgepedia.org/edgepedia/license