| Roles | Competed in Youth Olympic Games | |
|---|---|---|
| Sex | Male | |
| Full name | Lee•Seong-Yun | |
| Used name | Lee•Seong-Yun | |
| Name order | Oriental | |
| Original name | 이•성윤 | |
| Born | 18 January 2002 | |
| Measurements | 180 cm / 64 kg | |
| NOC | Republic of Korea |  KOR |
| Games | Discipline (Sport) / Event | NOC / Team | Pos | Medal | As | |
|---|---|---|---|---|---|---|
| 2018 Summer Youth Olympics | Athletics | KOR |
Lee Seong-Yun | |||
| 5,000 metres Race Walk, Boys (YOG) | 10 |
