| Roles | Competed in Olympic Games |
|---|---|
| Sex | Male |
| Full name | Yu•Yong-Seong |
| Used name | Yu•Yong-Seong |
| Name order | Oriental |
| Original name | 유•용성 |
| Other names | Yoo Yong-Sung |
| Born | 25 October 1974 in Dangjin, Chungcheongnam (KOR) |
| Measurements | 173 cm / 69 kg |
| Affiliations | Hannam University (KOR) / Samsung Electro-Mechanics Co. (KOR) |
| NOC | Republic of Korea |
| Medals | OG |
| Gold | 0 |
| Silver | 2 |
| Bronze | 0 |
| Total | 2 |
| Games | Discipline (Sport) / Event | NOC / Team | Pos | Medal | As | |
|---|---|---|---|---|---|---|
| 1996 Summer Olympics | Badminton | KOR |
Yu Yong-Seong | |||
| Doubles, Men (Olympic) | Kim Dong-Mun | =17 | ||||
| 2000 Summer Olympics | Badminton | KOR |
Yu Yong-Seong | |||
| Doubles, Men (Olympic) | Lee Dong-Su | 2 | Silver | |||
| 2004 Summer Olympics | Badminton | KOR |
Yu Yong-Seong | |||
| Doubles, Men (Olympic) | Lee Dong-Su | 2 | Silver |